The pitting is not too deep so here are my thoughts. Hone the .735 barrel just to make sure the pitting is at least rounded as supposed to sharp. Leave that choke at .23. Backbore the right barrel from .729 to .735 to get rid of all the pitting in that barrel and have .006 choke. Ask Ken Hurst to checker and improve the solder between the muzzles. Renew the stock finish and change the white line pad. Then have fun! Sounds like a plan.
I doubt the store will move on the price based on previous experience. I will still try, though.