IF I had to go with what you are using for a rear, I'd put the front on first then tape or glue the rear in a few differnet places and just go outside and see what my eyes, with correction that you would be using, tell me is best.
Amen !
...preach it, Bro !
GTC
Another big "amen". You can't deal with personal visual idiosyncrasies by applying a formula. You really need to get out and shoot, or at least see the sights under realistic conditions. As noted, even a temporary cobbled together setup can be useful.
A real bonus would be to find an eye professional, probably an optometrist, who understands shooting, and is willing to work with you.
Man, I wish those old Redfield Patridge blades, later made by Burris, were still available.
Paul