First check to make sure your base screws aren't bottoming out.
I'd either bed it in J-B Paste, or (better) lay emery cloth on the receiver grit up and slide the base over it with a little pressure to lap the base for a gapless fit. If the base is steel reblue the underside before reattaching.
I use blue Locktite on base screws, and whether or not the mfg. recommends on the ring screws. A 6-40 screw is good at 22 to 23 in lbs.
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