With your set up I would recommend Magnus Stingers or Stinger Buzzcuts 4 blade or Slicktrick Vipertricks. Both are cut on contact.
I personally like the muzzy mx-4's just because of the zero failure to open. But then again im new too.
with your pull weight I would recommend a very sharp, small diameter fixed blade for more penetration. I like carbon steel montec and slick trick regular but find what you like. I would avoid the fancy heads like toxic, go with something simple and shoot it enough to gain confidence in it. Good luck with your hunt.
I am agreeing with everyone. I love the Grimreapers but if you aren't pulling back at the very least 55 then I would go with fixed. My wife shoots Slick Tricks and those bad boys are so sharp you could cut yourself while putting them on.