This may be a stupid question, but... did you build the wing upside down? i.e. Anhedral instead of diheadral?

I've been flying mine for a while. With the CG set at the rear of the specs and 1 degree of upthrust, it is totally neutral inverted or upright. But it is a real handful to land. Incidence is 0 degrees, right thrust is ~3-4 degrees (had to offset the engine to line up with the cowl). Weight is a touch under 12 lbs.

I moved the CG to the forward position. It is now a joy to fly. Takes a lot of expo to tame the elevator. Needs full rudder but with that it can do a knife edge loop. Tumbles like a leaf. Elevators, walls, et-al. no problem. Suprising stable for it's ability to tumble. I'm kind of diggin' it!

OS 160, Perry pump, 16x8
5ea 5925's
1ea 225
Jr1400
Futaba radio gear
YMMV.

Best of luck with yours,

Scott H.