So Glenn if I am reading this correctly, your running a 16:1 mix ratio. That’s the heaviest I have heard of yet, but if it works, it works. Most all of the info I have been able to find claim 20:1 for break in, about 6oz to the gallon, and thinning oil out a bit for racing. I guess as long as you jet accordingly, there shouldn’t be much issue. Do you have any problems with fouling plugs being that rich with oil?
I have a friend that does well, with a ICC engine and the Delorto carb, and he was running a 140 main to be safe on our day. Temp was mid to upper 40’s. I haven’t asked him yet, but rumor is he runs 40:1 mix ratio, which is less than 1/2 of what you’re doing. I’ll try to see if I can get a little info out of him and find out his actual gas mix.