1. maybe you should check neck to body angle and correct it with shim,
2. regarding tremolo height from:
This is just my advice. Read my and other posts and decide yourself.
I would never change bridge height on full tension.
First of all, regarding height of tremolo, if you want to play fast you need some resistance from guitar.
You will play faster in medium high action then on (silly) low action. You need strings to fight back. If action is to low when you play very fast, like Vai or Malmsteen, to low action make strings become to soft. This is in case if you pick, but if your playing techniques like Stanley Jordan who exclusively taping on neck with no picking, then you need action low as you can achieve. That are two extremes, Tosin Abasi is probably in the middle.
Regarding changing bridge height on full tension,
if knife edge is proper condition, then you have ONE returning point,
so if You push bar down or pull up it will go back in same returning point,
and guitar will be always in tune.
If you have damaged knife edge, your returning point will split in TWO returning points, when you push bar down bridge will go back in lower returning point,
if you pull it up, it will return in higher returning point. It is not end of the world, and lot of guitars are perfectly playable in that condition, because you will tune it to one point and always return it to that point. Pro players are doing that all times.
This sound complicated but it is not. If you tune it in higher resting point, if you pull bar up it will return to higher resting point, and you do not have problem, if you push bar down you will not just let it rest on lower resting point, you will either on way back raise it slightly to jump to come back in upper resting point or put it in upper resting point by bending strings. If you do it few times deliberately, soon it will natural to you.
On quality bridges knife edge is very hard, so you can change bridge height on full tension few times without damage,
on softer bridges knife edge will be damaged faster if you change bridge height on full tension ,
and on too soft bridges, knife edge will be damaged with just regular use, even if you change action without tension.
Some players are using lipstick balm or similar as grease in place where posts and knife edges have contact.
Again, to claim no damage on rotating metal rod against sharp knife edge on full tension is er.. stupid.
People for centuries sharpen their knifes with piece of metal pressing(that is tension) against knife edge.