To prevent flying titans from being overpowered, we need to modify the equation itself to increase the effect when using smaller creatures. The current equation is 100hp/(100+hp), which is caps at 100 damage (yeah, calculus stuff) from 75hp/(*some number I don't know*+hp) which is caps at 75.
If it was modified this way, maybe like 75hp/(50+hp), a titan would still deal 37 damage (assuming it's rounded down) but an upped voodoo doll will deal 21 damage instead of 16.
Damage will increase, but it still caps at 75 to prevent almost-1-hit-KO tosses.