I run mine with a APC 11X6, no baffle, and just let it sing. It's nice and happy and the throttle response is good. Around 13 to 13.5k. My issue would be how rich I would have to run it to get only 11.5k with an 11X5 and how much damage I would be doing to the motor running it that rich, it's not a Fox 35!

I'm thinking the "oil rig" is more unburned fuel than anything else. My guess would be that you will burn up any ABC/ABL engine far faster running that rich than running at 14 to 15k every run. How many people have ruined their ABL engines just by running them too rich durring break in.