Zero shift from skim bedding

[BPTactical]

Yes Tim and I would suspect the torque is your causative factor. The role of the bedding is to provide a stress free 100% contact between the receiver and stock.
A 1/4x28 screw torqued to 56 in/lbs equates to over 1500 lbs of clamping force.
As a result it doesn't take much torque to hold the action securely.
If the torque is excessive or uneven it can certainly cause a shift due to stressing the action.
You mentioned painting, did you paint the bedding? Any paint there will compromise the fit between the bedding and action.