In the seventies everybody at the local club was using FOX 35s with 75/25 castor fuel.The same for every other glow engine. Nitro was simply horrendously expensive in Italy at the time.
No starting o behavior issues of any sort , almost every engine started first flick with usually a generous prime both in the carb and the exhaust. When mufflers became a norm, only carb prime ...sure when I tried 5% nitro needle settings became way more consistent ( I even used to cut a slot in the cowl to detach the engine without disturbing the needle for not to loose that "magic" setting found ). No particular power gain over straight fuel, as far 5% nitro. Maybe with more....
Also the we always used the original FOX needle ( even if whe had lot of cheap Supertigre needle valve assemblies ) because, once used to the strange one click=lean-two click=rich behavior, no problems of any sort.
When the fashion was toward ST 46, whe had a hard time to find again that FOX built in stunt friendlyness ( 4-2-4 etc .... )

I think your fuel is good to be presented to your closest competitor ( or...maybe actual FOXes are not the same as before, who knows...)