Mike-
You're missing one point...
When I hooked the QA42A thrower to my 1872 (same as a 982 w/power-steering) the thrower's linkage wouldn't allow it to come closer than about 2" from the ground without even attaching the lift rod. The linkages would bind before it would touch. Perhaps those curved rods would "fix" that, but I can't imagine the u-joints would like you very much at those angles. I took a pic of it, but that was a few years back, so it's on a different hard-drive.
I'm tempted to say that this thrower just won't work with those taller tires. <font size="-2">(Of course the minute I say that, somebody will prove me wrong.)</font>