From the pictures it appears that maybe the base where the magazine charger was is too wide on the left side, and the causes the base to be slightly canted from left to center going back to front. Is it possible to remove a small amount of material from the rear base to move the rear more to the right on tightening?Pictures of offset aluminum mount. I hope I’m just being hypercritical but when you line up the rail, it’s definitely left. The photos may not do justice, but I put a string running from the front sight post to the rear peep hole. Hope this helps.
This is strictly my opinion based on your pictures. Others may see things differently.