Well, since you brought up the 2300 thread, I will remind you that during my nitro tests I found that the engine ran cooler on 15% than on 5%. It also ran much much better. I used several glow plugs and took the time to adjust both needles meticulously for each condition. I'm saying that my G90 runs fine on 15%, and because it does, I have no cause for extensive testing. If it were to ever give me any sort of trouble, I would try other combinations till I was satisfied that I was getting the best overall results.

By the way, I'll soon be reviving that old 2300 thread as I have more things to try. I bought a new carb barrel for the stock carb so I can get back to square one. I modified the metering slot in the original one and never had any luck.