Usually this is caused by your arrows being right on the edge when it comes to your tuning. The arrows are able to recover when your shooting a field point but when you get something that's both heavier and has blades on it then your tuning really catches up. I don't know how you currently tune your bow but I always tune mine with broadheads first and then I know the field tips will fly. That being said, where ever your string knocking point currently is raise it 1/8" and where ever your current brace height is raise it 1/2". This usually takes care of most bad flight but if it doesn't then there's a bunch of other factors to consider. Good luck!