Its not near 8400 I run im at 8500 rpm In deep long pulls.... iv seen 8700 8800 rpm on hard pack but hp Is long in that rpm. And yes the pvc and dynotech map fix the lean spots and timing.. I have one coming, in the mean time I was using eth mod, but still det, so I added a resistor and it's good tell I get the pvc.
Did you try running in non ethanol mode with the resistor? Just curious if that is possible.