Mickey- One other thing you might consider is the "normal" direction of the throw-- that is, if the discharge chute is working with the direction of the fan's rotation, it will throw a lot further than if the chute is trying to "reverse" the flow---
Not very well explained, but on my 2310, as well as on the Kubota in the above video link, the fan direction (clockwise as you face the blower) is oriented to throw "normally" to the left of the tractor; if the chute is pointed left, there will be much less resistance in the discharge chute.
Under heavy snow conditions, as much as possible I always try to blow to the left. My old walk-behind was the same, though its favored direction was to the right.
This is the same principle involved in "squirrel cage" (axial) blower fans in HVAC equipment: discharge always is set to favor fan rotation rather than work against it. Hope this helps-- try it!
I also agree 100% with Ductape & Evil-- it's somewhat counter-intuitive, but often an increase in speed, resulting in an increase in volume into the blower, will make a dramatic difference. Just be sensitive to bogging down, and back off a bit if necessary.