Stay with the 5 grain per inch rule for your bow warranty. I tried 145 and 200 grain broadheads before with a 65 lb recurve and aluminum arrows and it didn't work good for me. The arrow tuned up good, but my penetration on deer sucked. To much blade area and I wasn't getting good penetration on game. After about doz deer I went back 125 grain broadheads and they work a lot better for me. Doegril75 is right you should be shooting around a 400 grain arrow and with your poundage you should be able to blow through any thing out their. I'm doing it with 400 grain axis and a 85 grain thunderhead with Diamond Black Ice at 65 lbs. Two this year and it was like I didn't even hit any thing and just shot the arrow into the ground. They don't go very far that way one was shot at 25 yards walked off about 25 yards and the other at 30 yards and ran about 60 yards on a dead run. I seen both of them go down the way I like it.