As far as fixed shooting as well as field points,that just isn't going to happen.
Sorry, but my Muzzys do out of my setup or I would not use them. Of course I spend a lot of time getting them to shoot that way.
I have not yet tried mechanicals so I cannot comment except to say I just cannot make myself yet try a head that has to open up upon impact, maybe this fall I will give a mechanical head a try.