As I recall there were two Redlands, one by Big Bear and one up in Northern Calif. and both of them were quite a ways above sea level, how high is it where you are living? I moved here to the Vegas area from the hills just outside of Yosemite and I flew a lot down in the central valley and there wasn't any difference that I could notice. I have talked with guys from Denver and was told they just bumped up the nitro content in there fuel and it corrected the problem of lost power? I have also been told that they just run a little bigger engine to compensate. For every problem there is a cure!!