First thing I would do is get an arrow spinner and make sure the broadheads are spinning true as well as the nock end. This is an absolute must have piece of equipment in my opinion for anyone shooting broadheads. Once you can determine they are spinning correctly, I would shoot through paper at about 6-7 yards to quickly determine if they are doing anything crazy. Provided you have a half decent hole, I would then adjust your sight to compensate for the fixed heads. Trying to tune fixed heads and fieldpoints at this point in the game is going to open a can of worms I wouldn't want to deal with at this point in the game. If the paperhole indicates that you have half decent arrow flight, thenjust sight in for those broadheads and don't worry about it.