C_Roundy,
I've seen this discussed before but never with this particular aircraft. I intend to experiment with this when I finish my own US40+. Can you tell me what you mean by ''small increments''? 1/4''? 1/8''?[/quote]
about 1/8th". Unless a wing has a much broader chord than your U.S. thats plenty to feel handling change with each push rearward.

Fully expect the elevator to be more effective as you go, and therefore require decreased deflection at full stick (this is a good thing) but anticipate that it will be the case.

The simplest procedure to find the sweet spot, is by continuing to push rearward until you feel a little twitchy-ness on the pitch axis.

MAKE SURE THAT YOU REMEMBER TO REDUCE ELEVATOR THROW PROGRESSIVELY AND REFLY UNTIL THE ELEVATOR THROW IS OPTIMIZED FOR THE C.G. UNDER TEST, BEFORE REACHING THE CONCLUSION THAT THE C.G. UNDER TEST IS TWITCHY.

When it finally actually does become inherently twitchy, pull it back forward from the last 1/8th" push you made. Your pretty much done at that point, although really discerning modelers will fine tune it down to 1/16th" or even further, tuning the last 1/16th" is as small an increment as you will probably be able to feel.

I guarantee once you've dialed the airplanes handling characteristics in this way, the pilot workload in slow flight will be waay less, the consistancy of the planes responses to your control inputs across the whole speed range will be greatly enhanced, landing aproaches, and especially the final flair to touchdown wil be so transformed that your buddies will all think you've mysteriously become a better pilot.

Almost forgot, use temporary weights (safely) to do the change increments, so you can get it all done in one afternoon, darn well mark that final magic spot accurately, then take all the temporary weight off the airplane and do WHATEVER IT TAKES to make a new permanent battery mount however the heck far back it has to go to make the plane balance on the mark. Done.