First you NEED NOT GO HUNTING.. UNTIL you get the Proper arrows, and sight your bow in for those arrows. Not two different size arrows.. Of course it will shoot different!! Get your gear together first, sight your bow in with your NEW ARROWS and Broadheads attached, spin test your arrows, and then shoot them. You really should paper tune it first, but I'm not going into that right now. After you get your NEW ARROWS and BROADHEADS sighted in at say 20 yrds, replace the blades or resharpen the blades and there you have your hunting arrows. Your not going to beable to shoot 30 and 40 yrds with broadheads unless your equipment is Tuned right, and by the sounds of it, I highly doubt it is..