One other suggestion I'd give about a super tight leather holster. Normal "blocking" the holster overnight was not enough for a super tight holster I had once. It seemed that blocking it made it easy to holster and draw the gun while the holster was not being worn. But when the holster is actually attached to a belt and a body, it pulls the leather in a way that holds onto the pistol even tighter.
So, one weekend when I wasn't going anywhere, I put the unloaded pistol in a couple layers of wax paper, put all that in the holster, and then put the holster on myself with a stiff gun belt, tightened everything up, and wore that whole thing around the house all day. This provided the additional "stretching" that seemed to be needed in order to make the holster work.