CAMBO get off the 30% and go for some reasonable fuel like 10-15% I'm sure OS doesn't recommend 30%. To make it easy Wildcat makes 2-4 cycle blend with 18% oil that will satify most engine waranties. You just don't have your engine tuned right yet. The smaller the nitro % the better the fuel mileage. 10% will do you fine and start with a new F plug. Dial in your low speed better.

Morgan Omega is 30% castor and only 17% total oil. Thats 10% more castor than Wildcat.