Sounds like you are getting there,

I agree, I would have thought you can use less ether for a larger engine, but you can experiment with that later. 30% should be fine.

DII isn't absolutely required but it does make things a lot nicer. Starting is improved, you can run lower compression, and settings are less critical. I use 1% and that makes a noticeable difference, 1.5% should be fine. Amsoil is the way to go.

I'm intrigued by the 'silicon O ring', is this just a ring sliced of the end of a silicon tube? What diameter? How much is it compressed by? Do you cut a square cross section or a bit longer like a sleeve?

Well done so far,

Dave H

BTW well done on the 'redneck' prop load.