With the bottom end jetting being as lean as I could make it, it was still rich and stumbling in the midrange.
One can lean out the AFR by changing the oil/fuel ratio, changing from 32:1 to 25:1 is about 1 jet size / one to two needle clips leaner.
One can fine tune the AFR simply by adjusting the premix ratio.
There is also the added advantage of slightly more compression, giving a little more power, owing to the extra oil.