Every spring I spend a fair amount of time (at my wife's insistence!) picking rocks off the lawn. With the first couple of snows of the season, before the ground is well-frozen, its hard to avoid shooting some rocks. I have special problems with the transition of my driveway from flat to sloped...where the blower tries to dig in. Also, I re-gravel my drive every five to seven years and the problem is worst for a year or two after that, before the loose rocks get pressed/packed down into the surface...oh,yeah, the crown in the drive also gets scalped some!
I'd say in coastal Oregon the surface will never freeze into a hardpack, so that "solution" won't work too well. The best you can hope for may be setting the skids as high as possible and just living with the inch or so of leftover scum of snow.
I'll often blow as much as I can, then do a final forward drag using the backside of the blower like a blade; I've found this isn't a good move just before a hard freeze, though...it just creates a nice, smooth driveway skating rink.
BOB