Well there is always the "Magic Blue Smoke" to consider besides that piano
Um I run Lucas semi synthetic and at 16 to one it is oily at every point it can be after a gallon of break in.
Went to 24 to 1 yesterday so I will run that mix a while and then move on to a thinner oil mix.
Smoke? yeah at times I see some when I stop for a light with such a heavy mix.
It's a RAW by the way and seems to run well. It handles 30 mph with me 260 pounds and a backpack with tools very well.
I too have about that many miles on a new motor but about 900 miles on the bike since this is the second engine.