For what it's worth I have heard that excessive oil contributes more to
deposits.

Shortwave Sportfishing wrote:
Interesting stuff - as soon as I finish compiling all the information
I've received from various places and manufacturers I'll post it.

But the major advice seems to be, if you have a non-injected normally
aspirated carb engine, add more oil to the mix - go richer on the oil
mix.

Makes sense to me.