Mustang Bob, you certainly got the MAC calc right. Thanks for the clarification. I agree that 25% is a good start. I have found on tail draggers that the 25% can make a nose over easier. But I have had a few nose overs with no damage, so better to be stable in the air. 30% is a little more touchy, but I find sometimes that I run out of pitch authority when flaring for a landing at the more forward CG positions. I guess everyone must find the right "balance."
Thanks again for the good input as I am sure it helps others (and me too!).