Judges?

Yes, actually I buy 15%, and then ad a few oz. of castor. I run this mix in ALL my engines, 2 stroke, 4 stroke, bushed, and ball raced. Even ran my K&B Sportster .45 on this fuel for so many flights, I lost track. The key is not trying to get every last bit of RPM out of them by running the nearly to lean.
BTW that's 4 oz. of de-gummed castor, and 2 drops of Armor-All ( it was originally used as an industrial de-foaming agent) to a gallon of 15% nitro 18% oil 50% castor 50% synthetic fuel.
Never had a seizure, never wore one out, period.

Jetts