do yourself a huge favor, and try G5 Montec. this is a great product. i use to shoot muzzy mx4's, and they were good too, but nothing can replace my montecs. i currently have shot 3 deer, and countless small game animals, and everything has died inside of 50 yds, and a good portion of theme were still in sight. on the other side, some of them have no blood trails, but i think it may be due to the fact that the animal does not live long enough to fill the body cavity with blood to start pumping it out on the ground. the one blood trail i did have was very impressive. i guess i dont see this as much of a problem though if you watch them fall. just my opinion.
Rage makes a 2 blade that's for bows shooting under 60 lbs. never seen any reviews on it, but I love my rage 2 blades!
Ramcats are the best penetrating broad I ever shot. Including some of old style COC two blade heads we used way back.... Ditto on the 3 VS 4 blade heads....seen it several times with under performance of four blade heads. Take a look at the cutting diameter of most four blade heads and you will see that manufactures keep it smaller for several reasons...fight and performance.
I also shoot the Magnus Buzzcut and they are great. Best part is if they are ever damaged you can send them back and have them replaced no questions asked.
4 blade stingers do an awsome job, only problem with them is you will have to clean the dirt off them !!!!
55 lb... should be no problem with pretty much any head out there except you may want to stay away from extremely large heads like three bladed 2 inch cuts. Other than that, pick one you like and shoot it accurately and you'll do fine. Aim small. miss small.