I'm not sure how the smoke thing works I have a asp 52 4 stroke turning a apc sport 13x4 at 9800 it's on a funfly that never sees full throttle except going vertical and no matter how rich I run it it doesn't put out much smoke so little in fact you really have to look hard to see it in the air even if it's so rich it is way down on power
So I run it maxed out on rpm then richen it till it drops 500 rpm with about 1/4 in it the tank and the plane held up vertical not much smoke
I was putting it on a new plane last week so I pulled the head to look it over and everything looked great a nice golden brown with no deposits
I think with todays super pressed castor and better oils there's just less smoke I run omega 15
now my son in laws satio 82 smokes pretty good on the same fuel not sure what the difference is other then I use a tach and he doesn't which I've told him would be a good idea.