You should use the broadhead that you feel comfortable shooting. Some people like the lighter broadheads since they're faster but you have a decreased front-of-center. If you are a good shot then you could pick a light one if that's what you like. I don't think it matters for deer if you're pulling 60 lbs in that bow. Some people like the heavier broadheads since you get more kinetic energy and an increased front of center. But, you sacrifice the speed. Personally, I use a 100 gr broadhead so it's kind of in the middle. For deer, I don't think it really matters but that's just me. If you used a 100 gr broadhead instead of your 125 you would notice a difference in speed and arrow drop but if you limit yourself to 25 yard and less shots the speed doesn't help you. It's my opinion that no matter what you use, you won't be able to shoot through much bone with a bow.