I'm not as experienced as alot of the guys here, but I elarned pretty quickly last year that when stacking snow its a good idea to not raise the blade to its max lift when pushing into the pile...you stand a really good chance that the snow will pop your blade up higher than the piston can pul it and then drop it behind a few hundred pounds of snow...if you leave an extra inch or so of travel you can still lift it over that ridge.
Another thing I've found is that you want to try to stack with the plow square against the pile...when I don't I find it usually tosses the rear end of my truck to the side when it makes the plow square with face of the stack...naturally this is almost always directly intot eh UNplowed area of my driveway. Last time this happened to me I had the snow up over the fender flares and had to dig wiht the shovel for like a half hour before the truck could even move.