av8tor,
You are at over 5,000 feet and Waldo is at sea level. An APC always turns faster then a TF prop. Just something to factor into comparisons. Many Ryobi people bend the reed stop out to allow the reed to open wider. Just make sure that it clears the crankpin by 0.020 or half a milimeter. The last Ryobi 31 that I measured had 150 degrees exhust duration stock. If you replace the thick cylinder base gasket with a thin one, you will get a little higher compression ratio. Maybe you should get higher RPM with your thinner air? Good luck.

Dave