Norm
I suspect you have a wing incidense problem, too much positive relative to the horizontal stab and engine thrust line. I believe some the other guys that responded also have this problem. Too much positive incidence on a high wing, flat bottom wing, tail dragger will give just the results you got when trying to take off.
Try at least a 1/16 or better a 1/8 thick spacer under the trailing edge of the wing. I think you'll see a vast improvement.