First, I dont think its a bad thing to post a long message here.. No worry mate
Second, I found that Sardius and Schlager blade has quite the same characteristic (Hard, stiff and speedy blade with limited control)
So I think the problem is the rubber.. Yasaka Mark V is a classic balanced rubber which you could safely loop with. Its a rubber that has passed the trial of time (Been around since early 80's if I'm not mistaken)..
In the other hand, Tenergy series is quite the new age rubber with completely different feeling (they are tensioned and manufactured in a different way)
Not to mention Schlager Carbon is a Carbon blade which adds up the speed, limits the control and damper your feeling of the ball..
And last, I think you shouldn't buy the rubber at MAX thickness assuming that you bought it at max..
Oh, and actually this is a bit strange but if you have the correct technique with the Mark Vs (10 year experience) I think a new setup won't a problem for you. You just need to adapt with the different speed and throw angle (more closed bat compared to Mark V)..
Feel free to make a new thread if you need help next time
I am a chopper, so I dont have much experience with Off blades but thats what I know.
Good luck and God bless your search.
Yosua