dwenham-- I do precisely the same, and it really works! With that blower, I can truck downhill and throw the snow across the road and up into the bank on the other side; it may look odd (thank goodness for the highly visible --annoyingly so at times-- hazard blinkers, I know I can be seen) driving & blinking down the road, but I take out about 35 yards to the left of my drive, ging out as far as the middle of the road: no snowplow ridges the next morning!
OKGarcia-- here's some shots of the large area I do in front of my garage, after our storm last Wed. Note how high it hits the trees.
Where are you located? Does the phrase "some portions have an 8' retaining wall" mean you're built into a slope? You'll learn to play with the blower, just like you had to with your walk-behind, but you'll have one HUGE advantage: the SCUT blower will be able to handle any pile that you encounter. As others have said, these things will eat into a hard-packed bank --of course, with some finesse-- amazingly well. Like others, I'll add that, although it means more "work," switching back to the FEL is not a huge undertaking, should the need arise. I keep mine handy, and do switch occasionally.