I can't explain it.

I flew the 665 with the new nose wheel this morning and it was more stable than ever. Somehow the nose wheel stabilized the plane in flight a noticeable amount. I had something similar happen several years ago when I put larger wheels on a plane so it's not uncommon. The plane landed as well as it had before but tended to tip onto the tail when the tank was empty. I bent the main gear some and now it stays on the nose wheel.