I'd pick a fuel and run it so you can take it out of the equation. I highly recommend running a mix of pump gas and unleaded racing gas. The leaded race gas works a little better but it will kill your O2 sensors. I'd say pick a fuel, figure out the theoretical correct AFR for that fuel as a starting point, then work from there. You have a lot of new stuff going on with your combo so you'll most likely just need to watch the O2 sensors and then cross check the plugs to see how they look.