Maybe you have to admit that your struggling to compete now,and it sound's as if you are the competative type.
Why not try Bench rest or something similar,closer range target's that you know where they are at.
I do feel your frustration but i have to point out that i hate the word discriminate,you make it sound as if people are delibrately pushing you out and that's not the case
they are just doing what every other club is doing.
Hope you find your solution somwhere in the shooting World