I checked everything on the crossbow Stan. Everything appears to be in order. The trigger on the Horton is atrocious though. Easy to pull a shot due to the travel and weight of pull. But, I used to shoot a bit better than I have recently. I'm not overly concerned with the groups. But, I'm like you and expect near perfection, which is a tall order. I didn't shoot much better today with unbladed Muzzy tips than I did with the same tips after attaching the blades. So the broadheads were not a big factor. I've noticed my groups with my rimfire rifles aren't what they used to be either. I think it is just part of aging catching up with me. Keeping my shots to twenty yards and under with my crossbow is what I have always done. I guess my fear is what Bambilastbreath touched on, wounding an animal and not recovering it.
I am using a Bushnell 3-9 scope that I've used for 9 years on this crossbow. It holds zero very well. I always shoot on 3X whether hunting or target shooting. I try to simulate my hunting set ups when target shooting. All my stands are set up with some type of rest to steady my crossbow when shooting at a deer.