ok, here is what I did to the stock rear sight. I shaved a lot off of the top rear portion. Having the metal v notch even or lower than the plastic caused double images.
I also made the adjusting slot in the blade longer to get it low enough. Nail polish shown here and on a dot on the front sight.
I also sanded the base of the rear sight to get it low enough. Didn't measure how much but I did it on a random orbit sander and it was enough removed that in order to get the rear sight to sit level I needed to shave the top of the rearmost round portion of the plastic breech. Sorry for the bad pic.
Probably took an 1/8th of an inch off of it.
Now at random ranges to 20 yards I can shoot a hickory nut off of a tin can every time.
What have you guys done?