So your tractor tire track is 10.5 ft wide measured to the outside of the rears and your chisel is 9 ft wide. So assuming the chisel is centered on the 3pt hitch, your concern seems to be the 9 inches on each side that's not covered by the chisel. I suppose there's a small compaction problem that results from this situation, but it doesn't appear to me to be a show stopper.
If you're concerned about leaving tire tracks in your newly chisled field, maybe you could rig up a simple drag to rub out the tracks and hitch it to your chisel.
Good luck
Yes you are correct in the situation. And yes I agree it is not the end of the world but a 9" strip every pass is nearly 10% of what I cover. If it was 9" on a 40' plow it might not be as significant but it kinda seemed like a lot percentage wise.
My tractor got here yesterday and the duals had to be removed for transport. I have been working on sliding the inner tires all the way in so that I can put the duals on in the narrowest configuration. Spent 6 hours yesterday moving one tire. It is a royal pain when they have not been moved in 30 years and are full of fluid and loaded up with cast weights.
I think my easiest solution is to weld a 12" stub on the outside of the chisel plow and add a shank on each side. Might cost me a couple hundred in parts and take a couple hours. Certainly will be easier then wrestling tires back and forth.