w/ brew you get tp in like 2 secs anyways and melee hits have FSTR cap, where was WS mods do not, so you're not going to see anything spectacular on a melee hit and you're getting 50/tic anyways so the tp gain from KC is highly devalued.
1200 a hit, up to 8 times per round, from the HP alone. Stack crit dmg+ atmas on to increase the crit damage from the weapon itself. Not saying it would be spectacular just want to see how high it goes.
I agree with Tiger, it doesn't seem necessary to KC zerg with a brew. Considering your HP stays capped, and while the additional effect of soul eater would be nice every time you strike, I think you might see higher numbers with a normal weapon.