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Your Western plow should have an adjustment to slow down the rate of drop if you find that your's drops too fast. Check out their web site and see if you can download the technical manuals for your model plow.
As others have mentioned, try to go slow and easy when moving snow. This is far easier on the truck and will give you great results.
Also make sure that you add some weight to the back of your truck's bed. As a rough guess, 700# or so should be about right. This will give you the traction that you need to prevent getting stuck. Many of the plow guys run some serious weight in the back of their truck.