Is this in a wood stock now?
If you've got the floorplate latch moving around when tightened, then you have a bedding problem that can be fixed. I would get everything bedded properly if I were you. There should be no binding when tightened, not even of the floorplate. That means that something somewhere is high-centering.
This is in a factory laminate stock. It was bedded by a local smith who came recommended to me.
I would guess the trigger guard and floor plate were not bedded by the local smith?
It sounds like they need to be so that they are level when installed and not "rocking" back/forth (high-centering or just plain un-level) as the action screws are tightened.
