Thanks Ken.

If the main cause is the wind, wouldn't this cause the plane to turn out of the loop in opposite directions at opposite ends of the pattern?

I am still currently working on finding the right CG. The plane balances according to the directions, but I was told a good test for sport planes is inverted flight, and the amount of 'down' elevator needed to fly it straight.

Sounds like it's a normal phenomenon, though, and that I plainly need more practice. Thanks for the help!