It's not quite optics, but it has to do with my aim. I have a 590 Flex, and when I use the regular tail stock, it seems I am always punching myself in the right side of the nose with my right thumb as I sight down the barrel and fire. I popped my self pretty good the other day, so I'm wondering if it's my technique or some other problem like needing a cheek riser. This doesn't happen when I attach the pistol grip stock, and I know, just use it instead, but there are times when I like to change it up a bit. Any help would be appreciated!