I'm not running any timing control. I run 26psi with 93 and fuel additive. Always run a little richer if running w/o additive. My datalogger reads timing and stays between 13 and 15 degrees. Always goes a little lower at 4900 rpm, around 13 degrees. It goes back to 15 after 5000 rpm. No matter how many runs I make at the track, always watching the EGT, AFR and datalogger info. Also, I do a compression check everytime after the track and get 180psi all across.