I've had it.

[xX-SiLeNcE-Xx]

I used to have the tipping problem... But I realised what I was doing wrong. I would try to go "force" the back wheels to stay on the ground by using my elevators. That was only making the problem worse, so when I stopped using elevators on landing, and let the plane come down on it's own, it wouldn't tip. Try this and see if it helps.