Someone that really knows (Full Scale guys) should answer this... I had a high wing tail dragger that would snap almost every time the tail was up and one wheel started to unload. We found that it had toe-in in the gear. As one wheel would unload, the other would try to track up under the fuse due to the toe in. A full scale guy told me to set the wheels to 0 deg toe or even 1 or 2 deg toe OUT. He said that this would cause the plane to try to stay on it's gear (one wheel down would track away from center, causing the other wheel to touch back down, keeping the plane under control). I checked mine, it was toed in, reset it closer to 0deg or even a touch of outward toe, and all was well from then on. Just my experience. But please check with the big guns before doing anything final.