Interesting. I have a 60" Allied Plain old 3 pt. blower and I plow a little over a quarter mile or so. I never use the blower unless I have to, prefer to use the rear blade going forward in all but the heaviest snows. Haven't used the blower with the current NH Workmaster 40, but I never had a problem with it digging in with the older, smaller tractor. Do you change the length of the upper link at all? First thing I would try if digging in would be to shorten up on that and see how it goes.
When I first moved to the Catskills full time, we got a four foot snow that made the rear blade useless, and I had to dig out with the little 54" loader, on a limited supply of fuel. Not only did it feel like I was clearing a blizzard with a teaspoon, but the depth of the snow made it necessary for me to back up, sometimes 100 feet or more with each bucket so I could find a place to dump it. I got about halfway down to the road and the fuel was so low I decided to just leave the tractor there, call my cousin for a ride and take my 2 empty diesel cans down to the road, walking half of it in snow that was over my waist. Got the 10 gallons, left one at the bottom and lugged the other to the tractor, dumped 'er in and proceeded to clear a tractor width path to the bottom to get the other can. About a day and a half later I had enough cleared to get my truck down and proceed to go to town and fill the cans again.
That's when I swore to get a blower. I still use the rear blade about 90% of storms and try to get out and clear it every 4-8 inches or so. I can shoot up and down with the rear blade a couple times in about a half hour. With the blower, I could wait until the storm is over, but it would still take forever. I don't know how the blower will work with this tractor because it doesn't quite cover the rear wheels, which could be a problem, though I would have the slope working with me most of the way. Time will tell. Rear blade with shoes works great as long as it's not over 8" or so. I only wish that with the bigger tractor I had an 8 footer instead of 6. Maybe someday..