with my attack of 81756
all 6 crit rits
2 windy, 1 gg = 66k damage
3 bp 1 heretic = 82k damage on average
2 rusty, 1 GG = 86k damage on average
3 sharp, 1 lr archer = 260k damage on average
3 sharp, 1 lr archer 2 imp = 580k on average
4 imps = 68k damage on average
for the imps, didnt have grassans to test with, but from memory it should get boost from the imps, to do as much damage as bp/drach rits
in damage all, bp and drach rit don't differ much. only thing drach has for it is the freezing, and the weaken all it shares with the grassan. and that you only need 3 slots.
if you want 1 very strong crit that demolish almost everything in time, sharp rit has a better boost.
to me balance seems rather fine. only thing annoying is the freezing ability on crits. if you want to make it less of a who has the most freezing, a changing to a chance to freeze goes a long way.