I know it's a stupid question, but did you set the c/g dry, or wet?

Ok.... I'll see if I can explain this in an "understandable" way. (cause I usually do things the hard way) I have the "C/G machine" from great planes or some company, and I modified the pads that the plane would sit on to accommodate a larger airplane by making a 3" x 3" square piece of 1/8" plywood with foam on one side- the 1/4" thick weatherstripping stuff you would normally use on a wing saddle. hopefully you'll know what I'm talking about- it's like neoprene almost- on the other side of the 3 x 3 piece, I epoxied an old female ball link pushrod end to it so that the ball link on the "c/g machine" would "pop" into the ball link and retain the 3x3 plates.
one thing to note, I also drew a line on the side the ball links were epoxied onto that was right through the center. this line represents the balance point as the ball link is on it as well.
now that that is done I took the wings, and drew out a couple of FINE lines about 4 to 6 inches from the root along the center of the wing tube on the bottom of the wing- both wings were on the tube so that I could use a straight edge and make sure the line that I was drawing was true.

assemble the plane ready to fly minus fluids, and use the help of at least someone else to position the plane on the "c/g machine" making sure the lines on your 3x3 plates are parallel to the index lines that you drew on the centerline of the wing tube. this should be the ideal starting C/G mark and then you just move components around and back until you have the "real c/g" trimmed from subsequent flights- Then, if you care to, you can go back and put it on the c/g machine and find out where the c/g really is-

Sorry- I know that could have been explained a lot better, but it's the best I could do to explain it-

** another note- I feel this is a much more accurate way to measure the c/g, but everyone has their preferences- tom suggests to put both wings on the tube and take a string from tip to tip parallel to the wing tube in the center of the tube and mark the tips in that location. then assemble the plane and support it with your fingers (one person on each tip) to find the c/g. nothing wrong with this method, but my fingers are like 3/4 of an inch wide, and its a bit cumbersome to move things around in the plane to adjust the c/g... just a bit more leg work.

Anyway- my 2 cents..