Hybrids count in both classes.
Define Hybrid please. Am I a hybrid just because I use a spear as sidearm with my thrower? If yes, every ranged class that
carries uses a melee weapon should be counted as hybrid.
I think a simple "max 2 cav" rule would solve most the balance problems, everything else is just bad choices. Enemy got 5 throwing lance throwers? Sit back and long range them with your archers. You participate with 5 2hand spammers without bringing your own ranged, well, bad luck, bring a squad of huscarls, you win.
And please less gold limit. A limit of 100k for 5 players is enough. You want some fancy cav? Prepare to bring peasants.