I am pulling back 55 pounds with a 27 inch draw and am shooting around 225 fps. Since i have a slower bow would it make more sense to use a cut on contact broadhead.
That' not slow.

I think we're talking about deer here right? I think Slick Tricks would be fine. However, if you are concerned about penetration on game, then yes, go with a cut on contact. I use Magnus Stingers and Muzzy Phantoms with my longbow. I believe Grizzly 160 grain have the best penetration in testing. However, we're talking about game much bigger then deer. I'd give the Grizzly's a go, but I have trouble sharpening a single sided blade.