As said now you have tools to made perfect training if you know how to do it to improve performance.
The good coach don't change your way of play, have to improve your skills and null your faults.
Coach have to be a creative person that each training session will be different and encourage...
In my club I filmed with smartphone the players so them can see how do the mistakes that I point them because everybody thinks that are playing well but when you see how do you play things become more clear & you understand better what's the coach is correcting, one picture is better than 1.000...
It's not the number of coaches, the important it's the quality of the coach/es. Like training: no matter the hours you train, matter the quality of your train....
Time ago told to a team mate that don't liked the Zyre-03 (he's using H3 National 40º and D09C both boosted with Haifu National Yellow) to boost with two thin layers of Falco Tempo Long Booster the Zyre-03 because I suspected the no dwell time is for the hard rubber no top sheet related problem...
I agree one coach, not agree replicate the coach play style.
Only more coaches if for different reasons:
-Physical trainer
-Mental trainer for matches
-Strategic trainer for matches
-Technical trainer to correct (depending level player) about how to: hit the ball, position before hit the ball...
Fastarc G-1 is a good alternative because isn't bouncy so more control but also requires mor physical strength to engage the sponge to make strong topspin, it's topsheet is very grippy and or tacki but not sticky.
The problem is that isn't stated the kind of hardness, I'm not looking for the soft sponge to dampen the LP or to increase backspin used by classical defenders.
I look for hard or semi hard because I want to use for close to the table or mid-far the table not far the table.
Gràcies Xavi...