My 2011open gun. 8lb recoil. 17lb mainspring. 2lb trigger. I light off CCI SPM /SRP with no problems. Sounds like you have a solid set up. I would watch for high primers. Call the builder.
I've got the same gun/barrel combo. With blue Bullets 125RN 1.16 was the longest I could go. Also it leaded the comp something awful. I'm now loading MG CMJ which Dan recommends.
Dallas pistol club is a 3 yr wait. I know I just got in. Try pro active defense it's out at 35W and 1171. You can do all the action shooting practice there.
crimp does not prevent setback. Proper sizing does. You also could be over belling the case which would cause the issue. A U die (undersized) will help.
If you know how to fully strip your gun for cleaning.(if not gunsmith). Get an Ed brown jig and a couple of stones. About 100 bucks. No gunsmith wait or shipping charges.