You have enough KE for a 4 blade, should be no problem. If you are worried about penetration get something with a cut-on-contact head. Magnus heads are very very popular for this, their Stinger Buzzcut is one of the best out there. The Lifetime warranty doesn't hurt either. Last year I was using a Bear Instinct at 59# 29" DL at 260 mph. I shot a buck quartering away at 28 yards with a 100 gr. G5 Striker. Arrow entereda little further back than I would like but it exited by blowing through the opposite shoulder. He went about 15 yards and piled up with blood everywhere. My KE was lower than yours and I had no problem taking out a shoulder.