Dickeybird,
I ordered some 5x3 cox props after getting those low rpm numbers with the 6x3 MAS props. They are not cheap @ 2.69 each from Tower. The new .049 and .061 Norvels should like them too.
I guess my plane was so heavy the last time I tried them, it was never able to get up to speed. I have learned not to use AA alkaline batteries

Larry, I'll have to try that razorblade balance, I have the balancer that you hold between your index finger and thumb and the razor blades will work with that too. Thanks for the picture.

Lynn