RE: 5 shot or all...2 vs 3 blades?
I touted mechanicals as the best thing since sliced bread from '95 until this seasons opening week.
JRW - Yes, mechanicals use up a percentage of the available KE.
I'm not debating, nor attempting to begin a debate of fixed-versus-mechanicals. If you are happy using whichever, GO FOR IT.
I've gone back to Thunderhead 85's (as BobCo earlier stated) for my own reasons. They have never failed me. I just got caught-up in the flood of mechanicals that were hitting the market.
IMO more importantly than what broadhead is used is putting the arrow through the deer in the right place.
GForce
Shoot often - Hunt always