Remember that I'm using my own plans. Wing cord is 10-3/8, span is 71, CG is at 3-3/4 of chord. That works out to 36% of chord which is considered high. It flys great. I'm still test flying it so the CG may change. The incidences are zero and the engine down thrust is 2 degrees. Mine was very nose heavy. I moved the wing back 9/16 inch plus I moved components back. It is a floater. Looks like it glides all day. Making a decent landing has been difficult since it does not want to come down. I'm using an OS 46FX idling lower than I have ever idled one. Prop is 11 X5 APS. I may go to a 12 X 4 APS to see if it will slow the plane more. I have been landing on the mains and frequently nose over. The main gear is centered about 1/2 inch front of the wing LE so it should be doing better. Last few landings I flared more and this was a big improvement. I have not been flaring because I was afraid of a snap roll. I picked up an elevator flutter at high speed. I was using a piano wire bent into a C between the two elevator halves. It was .072 diameter. I just changed it to .093 diameter and would recomend something closer to .11 diameter. I also added some weight near the elevator TE in the form of three bamboo skewers to serve as dynamic vibration dampers. You say you lost two COROCUBS because they were tail heavy. Did you get them up in the air and around the field? You do know that a lot of right rudder is needed at takeoff. My first take off was a snap roll into the ground. I had forgotten all about the rudder.