To CL engine specialists: I put a .15-III TV on the end of my Ringmaster Junior CL plane, in place of the OS Max .15FP-S I had. Fuel economy was poorer than the OS. Running it on 2 ounces was about the same length of flight as with 1 ounce on the OS. They both had Masters 8x4 props on them. Should I try say, an 8x6 or 9x4 prop on the Enya to get better fuel economy?