Tricycle Gear Balanceing

I've got a reall awsome plane in the making (I don't think it's real though) but it's a tricycle gear and I don't know how to blance tricycle gears. And don't say just move the center gear contact to the back cuse' i tryed that and then it fell on it's face and the tail was still too hevey in flight so it always stalls. [glb]>:( man I'm so dang anoyed with this.[/glb]