RE: Muzzy 90gr 4 blade grouped 4in below points 2day??
Theres always the case that some broadheads just won't fly with your setup. Maybe the new heads will hit with your FP's. I made the mistake the other day of moving my nock down to achieve broadheads shooting with my FP's. Well, this lead to other things but I wished I would just have moved my sights down a bit a couple days before season.
I would not worry about it as long as your BH's are grouping well. Move your sights down.