I have a tip for you but you have to promise to not tell anyone about it BTW I learned this AFTER having Truglow TFO's Professionally installed at a local gun shop and the front could be shifted with a firm push of a thumb.

The tip is to clean everything with rubbing alcohol and then use Red Locktight while putting the sight into position. This will even lock in a sight that can be moved by thumb pressure, for almost 10 years now. Point is if you stone the bottom of a dovetail a bit too much Red Locktite is an effective solution.

BTW the tip of putting a small flat on the tips of the dovetail is EXCELLENT advice. Because many dovetail cutters have a tiny radius on the tips of the cutter to extend the service life of the tool by a factor of 4 to 10x (depending on the radius). Dead sharp points on milling cutters tend to wear or chip very quickly. They also create stress risers on the workpiece that can lead to cracks. So, if you assume your dovetail has a radius in the corners you need a corresponding flat on the tips of the mating part.