Don't discount the "old farts". The old farts at my field were creating this hobby with escapements, tube sets and 45 volt grid batteries in the 40's and 50's. The hobby is what it is because or their efforts. They had to know how to fly before computer radios and ARF's (aka "Talent in a Box"). Ask the old ones when you want to know how to tune an engine. There are no more "experienced" pilots than some of them. Just don't expect much torque rolling, but your trainer won't support them, anyhow.

The Wildcat 10% is fine. A trainer really doesn't need anything over 5%. Running faster or leaner just gains you more lift with a flat bottomed wing. My local hobby shop used to carry Omega, now S&W Fuels. I throw my fuel business to them. There will be times a LHS is worth more than mail order (like when you need a part before tomorrow's fly-in).

Enjoy!