If you are running with the exhaust hooked up, it might be strangling the motor. I would get a pair of 18 inch extensions for the headers and try running open exhaust. The extensions alone on an open pair of headers were worth a tenth plus on a couple of my cars.
I might try opening up the headers.
My wide band is back about 18 inches in the exhaust so I was wanting to see what the AFR was, but I'm happy with that.
It was annoying not to hear your own car, when the guy in the next lane is running open, which is most everybody.
