If I may add my many years of Mir experience input...
To be honest, come "end game", warriors in full kit become not only the best DPS, but become "Tanks". Why is this? Because you give them AC, HP, and DC. In my honest opinion, they should not get the amount of power they get for the amount of hits they take. If it were up to me I'd make Warriors the "Tank" class (literally there to soak damage, and do SOME dps) and that's that. If you want to take on a boss, you should require all classes. Currently the warrior role fulfils too much.
Wizards should be high DPS caster class, but dies in seconds. (No Protection Rings in other words)
Tao's the support class... obviously. Not the damage dealing own everyone class.
and Assassins the pure DPS class, but no defence what so ever.
If you can do that, you'll have a stable server. Put it this way, if an Assassin goes invisible (a perfectly fine skill to have if you have proper balance) and jumps a wizard on their own, they should probably die, this is to be expected. If they jump a warrior however, they will merely "dent" them. I think people seem to forget just what exactly balance is when it comes to Mir. Throwing stats about on a warrior just causes them to run around being unkillable and 1hit people. I do hope you find a good balance. I would prefer it if the "Tank" warrior class had ways of protecting his weaker, DPS classes. But this is something I planned to do on my own Server just never had the time nor coding knowledge (yet) to do so.
I voted for more accuracy (base 8) but honestly I hope you've removed Agility from the game, as that only destroys balance when someone becomes untouchable. If it's purely for monsters, sure, let assassins miss a hit or two without +ACC items, but when it comes to players, no attacks should miss unless by your own hand.