I am going to cut through some info. There have been a few good pieces of info here. And some that may be good in one context and not as good in another context.
The setup you want may be good for your BH, based on some of what you said. But probably would not be a great choice for your FH.
If your FH needs work, then a like a Viscaria-- which would be fine for someone who is very high level, but not so good for someone who needs to work on improving a stroke in the way it sounds like you described--would probably not be such a good choice.
Theoretically, the people who said you could change your rubbers first and not change your blade yet, they were on to something. Often it is better to change one thing at a time when you are choosing to use equipment that is faster and harder to control.
Also, the people who said going from a blade that is All+ to one that is on the fast side of Off (some call a Viscaria Off+) would also not be so advisable were onto something.
But rather than tell you what to get and what not to get, I am going to explain why a blade with carbon, a hard top ply and A LOT FASTER than your old blade, is not the best choice in changing equipment.
So, when a player is working on or developing a stroke (like the FH), and is a mid level amateur club player, a faster blade will cause that player to cut down their stroke to land the ball on the table. And that makes it sooooooooooo much harder to improve your stroke.
A medium speed blade (All+ to Off-) makes you actually have to be more precise with your timing and more precise with your contact and also makes you need to take a fuller stroke. All of this makes it so your stroke improves faster because the blade is not doing as much of the work for you.
Next piece of info: a carbon blade like a Viscaria makes it so most contact feels the same. So, if your contact is good, it feels good. But.....and this is important.....if your contact is lousy, a blade like a Viscaria will hide that and it will still feel good. With that bad contact, you will also still often make a decent shot. (The downside of a large "sweet spot") is you don't realize when what you have done is not good.
In contrast, an all wood, 5 ply blade with decent flex that helps you feel the contact of the ball, when your contact is good, it will tell you the contact was good because it will feel really nice. When your contact is bad, the blade will tell you the contact was bad and the shot will be weaker as a result. And the thing about this is, when you are constantly getting that kind of feedback, your contact, your timing and your ability to pop force into your contact get better sooooooo much faster because you feel it when it isn't right. And you feel it when it is right. And this happens without you even realizing that your brain and nervous system are adjusting to improve your contact and timing.
Add to that, the speed of the blade does not help you so much so that, when your timing is perfect, you start seeing how, you can really rip the ball if everything is right, and that gets you to learn how to get all those things--pop from hips, legs pressing feet into the ground, snap of elbow, whip of wrist--to sync up and get timed together. And therefore, your technique actually improves exponentially faster. Again, this happens without you thinking about it or realizing it is happening because of the choice of blades.
Now this is a dual edged sword here. If you don't care about getting better and improving your technique, then it doesn't matter and you could get the Viscaria like so many low and mid level players do. If the issue is that you want a blade you are in love with, and you are okay with it doing the work without you getting better, then a Viscaria with T05 is super fun to play with. And there are plenty of people in that category.
However, if you want to actually improve and get better and you are thinking long term, about maximizing the top level you cap out at, then you probably want a moderate speed, 5 ply, all wood, flexible blade that helps you feel the contact of the ball better. And it sounds like you may already have one that is excellent for that.
The interesting thing about all this is, when you take that slower blade and work with it for several years and get your technique so all those issues of syncing timing of all those different body parts to pop into the ball right on contact, then, your shots with the slow blade will be faster than the shots of your friends who were using a Viscaria all that time and getting speed simply from the fact that the blade does the work.
Then when you have that and you start to use the Viscaria, then your shots are 2-3x faster with the Viscaria and with more spin than those guys who were using the Viscaria the whole time, because, while they were improving, the subtle aspects of your mechanics were improving so much faster than theirs were.
Now, a story. I have a friend who is a pro tennis player. He also plays table tennis and is a decently high level amateur in table tennis. Last time I saw him was several years ago. He uses a Stiga Allround Classic with Mark V rubbers. I know, slow slow slow. Well, if table tennis was only about how hard you can hit/spin the ball, this guy would be one of the best in the world. His power is amazing. He can hit harder than many top pros with that slow setup. His mechanics are that good in large part because of how good he is at tennis even though they are different racket sports and he does not play TT like a tennis player.
If he could deal with the levels of spin that top players are used to handling, he would be in the top 300. If it was only loops and power of loops, he would be in the top 50 in the world as we speak. All with a slow blade and entirely because of how good his mechanics are.
But once your technique is solid and you are at an elite amateur level: top 100-150 in UK, then a Viscaria is an excellent choice and will no longer slow your improvement but actually aid your development.
Another note: Ma Long was in the top 5 in the world and still using a 5 ply all wood Off- blade in 2009. Look for footage of how fast his shots were when he used a Nitakku Acoustic. His shots are not as fast now. That is because he gets more spin. But the speed of his shots back then were that fast with a moderate speed blade not because of the blade but because of how good he was; how good his technique was. Ma Long upgrading to faster blades did not make his shots faster. He used the faster blades to add more spin and allow for more effortless play.
