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the turbulence/back pressure created by that empty can must be crazy bad. chuck it in the trash and get a high flow replacement cat. set the cams @+5/-5 or -6, fix the rest of the header back exhaust sys and, i predict you'll be right where you expect. be sure to use a wideband next time on the dyno. good luck bro!
This has been proven time and time again.
0,0 or 0,-2 makes more power everywhere over +5,-5.
Your problem is not cam gear settings. Its headers, good flowing exhaust and a tune.
I dont know why people keep doing this.