How about some weapon specific abilities?
Dagger +%crit, Sword +%dmg, Bow +%atk speed(aka balance), Crossbow +dmg etc. etc.
Also I think you should make a "defence mastery" by taking out the +hp from combat mastery and replace it with balance or protection ignore.
and make the defence mastery increase hp, defence and protection.
work a bit on the controls and give a bit more fuel.
As for the controls.. make the plane hover a bit longer and make it so that the chopper always tries to stay level, aka if you push forward it and release it will slowly level out.