Hello. I usually just slap a prop on the engine if its in the size range. Thats not gonna work anymore. I have a senior telemaster, saito 91, I had a 14x8, the airplane went around real nice, but I never got full throttle. So I put a 14x6, and I got full power, but the airplane almost stalls if any lower the 3/4 throttle. The telemaster should float with the wing. I was thinking of going down to a 13x8, but going down from a 14x6 to a 13x8 will give me more pitch, but less diameter, soI'm not sure. Any suggestions/opinions on what to do?