You said in your first post that the barrel was bedded...
That's odd, but not unheard of. Conventional wisdom is to free-float for consistency.
I suspect your issue is one of barrel harmonics due the barrel not being free-floated.
It shot well with the barrel bedded, until the action shifted.
Once it shifted, the contact points/pressure points on the barrel changed- for the worse. Even re-seating probably did not get it back precisely to where it was before.
You said you really don't like the stock anyway, so I'd replace it. Laminate stocks are fine but you need to install pillars at minimum and preferably bed the receiver as well- and free-float the barrel this time.
Or, get a composite stock with an integral aluminum bedding block and be done with it.
IMO, you may be chasing ghosts now as it may be impossible to get those magic harmonics back now. If it were mine, I'd grind out the barrel bedding to free-float it for the heck of it to see what happens.
07 FFL /Mosin-Nagant Custom Shop/Bent Bolts
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General Gunsmithing and Re-Barreling