I'm not sure if anyone here can comment on your style. Your fh pips smash swings look too long and loose to work reliably, but they clearly do work great. It sounds like health and fitness are your limitations right now.
Thanks for the feedback, it definitely will elicit some changes! It's not the first time I've heard of some of the feedback, but that's excellent. More trained eyes = more impetus to change when fitness allows. The swing size is a new one [it was said when I used MX-P on the FH, but not specifically for the pips]...
On the Pips swing, I'm thinking that a bigger swing is acceptable when I have more time [to graduate the swing speed and angle more precisely] - when I have less time.. small movement is preferred? With these SP's, you get a bulk of your power from a short, small action, so for me the long action is something to work on, but also it definitely makes countering topspin 'easier' to hit through so there is a 'reason' for it. Intelligent use case, I guess?
If you want something to work on maybe the quick, over the table pips attacks? Like you do a lovely one at :21 in the video, and follow up with a smash. At :33 you push a third ball with the pips and he pushes it back. Most opponents with experience vs pips will not push back your pips push, so it would be better if you are comfortable opening on that receive.
Absolutely, I love that you recognized that type of shot.. the over-table attack as is shocking to deal with for most opponents - you get a passive return to the over-the-table attack, and a follow-up smash is inevitable.. its an advantageous play, especially playing the dead ball to the backhand [handcuffs]. Interestingly, you can hit through topspin, backspin or no-spin, as long as you have good feeling and deal with the spin [or lack of], and the more height to work with the easier it is - but you can do it even on balls below net height as long as you take the speed off.
Also using pips it isn't usually advantageous to get into heavy backspin rallies. So if you mostly served backspin when you played double inverted, you could practice serving more long, and also dead and topspin or side-top serves. Anything that will get you a long ball, preferably a bit high. Because your fh pips smash is really wicked. And your inverted backhand is no joke either.
I definitely overpush - its a conscious move to save energy at the moment. As I hopefully better and fitter, I will have to unlearn that skill for longer balls, especially if I want to reach a really high standard. One interesting thing I've noticed though.. is that the combination rubber, combined with being able to push dead / light / heavy on the SP side without much tell, is that misreading of spin means you get some high balls from pushing. Players a decent chunk 'better' than me heavily struggled against my totally fatigued corpse even when my goal was to just serve ...and keep pushing until a high ball or they top-spinned a ball, but I think once you reach something equivalent to say a 2400+ level, that'll be rarer. You get this same 'uncertainty' when you loop, so there's no specific reason to just push - people can't read the spin on the loop [its so dependent on my acceleration at contact, which they a) Don't realize b) Don't observe c) I can hide this well even if a) and b) don't apply. Finally, even if they follow a) b ) and c), they are putting a lot of focus and that means they may not be prepared for other things.
The only other benefit of pushing aside from creating mistakes / high balls due to misreading the quantity of spin, is the open up loops [when they come] are often high arc - very easy for me to counter on FH, and either block or counter on my BH, but it shouldn't be some rally I actively try to engage in, as you say. Just a pattern of play I can use on low frequency, where I happen to have some hidden advantages [so many players open slow, topspinny to counter their uncertainty, and I love those balls].
[If we use Falck as a model, he tends to loop most long balls, but he does have some love for pushing a little more than the average double-inverted player, even against the top 5/10, who are obviously much more punishing / aware of how to deal with his style.] - I don't want to entirely throw out a pattern of play, whilst agreeing that it'll potentially hurt me against strong players who are used to this style / very strong players...and I just had a cybershape [carbon master] arrive in the mail. So creative pushing might stay in a reduced form 
[i'm very happy with my current blade, its just cybershape might be like putting on the FH SP...revolutionary for me. There's just so much feeling when you push, but I do want to reduce it by 60-70%!
So if you mostly served backspin when you played double inverted, you could practice serving more long, and also dead and topspin or side-top serves. Anything that will get you a long ball, preferably a bit high. Because your fh pips smash is really wicked. And your inverted backhand is no joke either.
I tended to use the same serves I was using in the match, however I lost a lot of spin from the layoff / playing against beginners so I didn't realize [Simon and the others on screen were down for a tournament]. The next best players here are around 1400 level, although a small town 40 mi away has 1 good and 1 top player [no stadium there, and they don't like travelling to train ].
The point is to get high balls back. So I do serve long more ['exploitative serving], but I did start practising [Simon and my mentor who was visiting] both said my serving had gotten very weak. The long serves were slow and not long, and I either need to keep it short, half long or LONG [last 2-3 inches of the table]. Getting a lot of spin, or using the pips to serve [can generate a lot of kick and spin with the pips, or light/dead spin to confuse with same action] gets the ball high now. Then Bh/Fh to sweep up!
So I've put a lot of work into creating a lot of different types of subterfuge, whilst having better precision / length on the serves, and doubled the spin on the 'spinnier' serves - it just makes the game so simple - serve well and 3rd ball.
I guess here's a 20s clip of what you've described - me pushing [to get me in trouble], but a shackling hit to the BH to get back some control...and then some long-gone physicality to show that yeah, my BH is no joke
