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.