Sorry to hear your having trouble with your LongEZ. I've been flying mine for some time now and have posted to numerous threads on the this model. I checked my balance point the other evening for someone here on RCU and mine balances at 16.75 inches from the leading edge of the canard. its balanced with an EMPTY fuel tank.
I may sound crazy here but you do have the canard elevator going in the right direction? They work oposite of conventional tailed aircraft. As for the verticle fins mine seem to have a slight lean to the inside also. I don't know it thats scale or a design flaw but thats the way they are. I have a retractable nose gear on mine and I see no change in flight attitude when the nose gear is retracted, it actually moves the CG back about 1/8 inch.

You may want to try something I read on the full scale LongEZ web page. If you have the nose of the model sitting at a downward angle it take tremendous amounts of elevator to rotate the plane on take off. Hence the dreaded departure stall, and believe me a canard's main wlng will stall. I had mine sitting nose down and it was a bear to get airborne. After reading that it should sit slightly nose hi on level ground I changed the nosewheel strut length a little, and it was a different airplane. Mine just lifts off nice and easy now.