it looks like there is alot of slop in the side to side (or lack thereof) of the plow. i think its supposed to stay straight, and it shifts a little bit to the side the snow wants to push off of. plus when back blading, the plow kinda bends backward a bit, and the blade is just riding on the snow, rather than pushing down and scraping. plus, with a lot of snow , it will not only want to ride up over it, but it will spill over the top, leaving you to go back over the same spot over, and over, and over again.
Ken