Maybe rubbing the trigger bars, the mag release has nothing to do with the mags dropping free, unless it is still rubbing when the mad drops.
Too long grip screws can do this look for rub marks on the mags, and the trigger bows, remove the mag release and see if that helps .
If it is just one mag, it could be a bit fat, but if all are doing it, something in the gun.
I don't have 10 rd, but have SS Wilson and they are VG and smooth, I see you took the grip screws out, check the screw bushings for a rough edge.
Remove the slide and shine a light up from bottom and you may see where it is tight .