Check list
barrel free floated
receiver not in a bind (I did notice that the receiver may be sitting a little higher in the rear than it used to.)
is scope mounted on a rail with built in angle?
are mounts level / is receiver machined level? straight edge will tell
as to reasons the factory barrel might have been a little off. factory lug might have been a little off or receiver face might be a little off. If everything checks out try reinstalling barrel with factory lug and see how close it gets. You might have a lot of inspec but on the edge of spec stacking up against you.
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