First off, best of luck to you. Yes, I would say what you experienced was normal. You are shooting a lower poundage bow with a short draw length. From what I have seen, using a heavier broadhead will positively affect your groupings and your penetration on an animal. Your fiance is able to use those 100 grain broadheads succesfully because more than likely his draw legth and weight are much greater than yours. If you are shooting well with those 125's, I would just use them. GOOD luck.