I think I have a ratio of about 1 death for every 5 butchers lol. Gonna try the undead slayerEr... pretty sure the Grim Reapers aren't spawning. Do you mean the ghostie-pumpkin grimm's? If so, they aren't that tough. An RC can easily handle them.
Butchers can be nasty, best thing against them is a sampire with an undead slayer.