I got this kit and am running it at 20:1 with synthetic oil. Right now I have to run it with the choke wide open, and the Idle screw all of the way in. If I thin out the mix to 32:1 or less then would I be able to close off the choke? It rich right now, though no oil is leaking out of the exhaust. I've already moved the c-clip to the top notch on the needle. With synthetic oil, I figure I could do a 40:1 mix. I'd like to know if this thought process makes sense or am I missing something else?