I flew my 58 incher yesterday again and, now that it's is trimmed perfectly, it flies as straight as an arrow.

Two things worth looking at are that it is very pitch sensitive, and only very small elevator movements are needed to get really tight loops, and, as further steps to avoiding snapping with excessive elevator movement, make sure it is laterally balanced.

The wing seems to be very efficient, and doesn't stall until going really slowly, but that means that any lateral imbalance becomes more noticeable when the wing does finally stall, and the plane can roll at very low speeds.

-David C.