First and foremost, thanks for the answers.
Now on to your points:
It is powerful, I agree, but how are you getting multiple trips? You can't trip someone who is already prone, after all.
Well, Bloodstorm Blade, Eternal Blade and Jade Phoenix Mage all get full BAB and are, without Ruby Knight Vindicator, probably the more powerful PrCs in that book.This probably shouldn't have full BAB, since pretty much no ToB PrCs do, and this is very powerful.
That's the idea.The counteractions thing is a great way to save up move actions.
This is why I specified counters against actions requiring attack rolls. Which is mostly attacks/strikes and touch spells. So no Step In in Mind over Body. And there are surprisingly few counters that qualify.Step in, especially combined with Follow Up, is very strong, especially considering you could get free trips for, say, using Mind over Body.
Well, that's are martial artist thing which has to do with body structure. I guess it's as hard to understand as it would be to explain. I just thought, for someone specializing in tripping there needs to be a way to trip nonhumans.Unbalance is kind of odd, since you making a balance roll has little to do with unbalancing the enemy.
Well, I wanted the abilities to synergize. Maybe I overdid it a little.Riposte is very good, especially so when combined with follow up.
I don't get the chain tripping thing, since you can't trip prone enemies. If it's just about lockdown a fighter with Robilar's Gambit and Hold the Line and maybe Martial Stance for Thicket of Blades can do it better, since for example Riposte is inferior to Robilar's Gambit in generating AoOs.Basically, if you outright removed follow-up, this would still be a very powerful PrC, because it's insane at lockdown; basically anybody attempting to do anything to you is going to be chain tripped and hit with multiple strikes.
I just tried to translate lockdown to a more maneuver-ish way of doing it, and Follow Up is more or less the source of damage in that. I agree that it might be a bit too powerful, but I don't think it's as insane as you make it out to be. I just never got how in whole 3.5 there never was an ability that made attacking prone opponents better.
By the way, you'd burn your maneuvers like kerosine...
EDIT:
Well, half of the 10-levls get 2, half get 3.
True, I kinda used a toned down Mo9 progression instead of the lower ones. I could use the Bloodclaw master progression, but I'd give it at least one stance, since the class kinda needs stances very much.
I guess I'll reduce the Maneuvers readied and known. Which amounts to taking out one stance and one Maneuver readied.