Chris, I don't know anything about Omega fuel. The YS 20/20 is a good choice for the the Saito. I run 30% Riches Brew in one of mine and PowerMaster 15% in the other two.

The prop size and pitch depends on your plane. The prop chart is a good starting point. The 13x6 will be a good break in prop but I hesitate to tell you what prop to use without knowing the plane.Just be sure on the first few runs to have a tach and keep the RPM below 6,000.

I use my own blend of after run oil to pre lube the engine. It's a mix of ATF and Mystery oil mixed 50/50. I have also seen guys use air tool oil and gun oil.

David