That is not unusual. (Make sure your bow is paper tuned)
If they group good, they might be wind plaining. Above 260fps is known for this. You can try a smaller profile B-head like Wasp-Boss. Most people just make the proper sight adjustment for their broadheads before hunting season. This is where a good sight comes in. The better sights have a master adjustment so all your pins or scope can be moved. I tell people to make a mark on the back of this adjustment where your F-point and B-heads fly. (Make sure your bow is paper tuned first)