Tuning with jets, Power valves and an O2 guage

I'm not a fan of the Demons - but I was going to suggest a rebuild and good cleaning/inspection. They are super-susceptable to crap in the passages. Carb size doesn't matter for you - yet. Also - the main jets should have nothing to do with the idle air mix. They will as soon as the throttle plates cover the tranfer slots - but at idle they should not. What is your initial timing setting? What rpm is it idling at?