The bow needs to be tuned for proper arrow flight and each arrow spin tested to ensure there is no wobble in the broadhead.
Feather fletch, helical.
3-4" or 4-3" should do the trick.Trad style heads seem to appreciate a little more FOC, as well.
I shoot a compound and two blade heads (muzzy phantoms, no bleeders) and the above quotes just about cover it. Start with a well tuned bow, an arrow that is spined correctly and 12+% FOC (my preference) and it should tune and shoot with FP's. You may not want to use 2 blade BH's if your going to be shooting over 300 FPS. I have heard the higher speeds are not friendly with larger surface BH's like a 2 blade would be.
ive heard that 2 blade heads like to be aligned with the string
I have not found that to be the case. It looks cooler with the BH alignedto the string but the arrow flys the same regardless.