It seems to me it's asking a lot to have them solve a problem that has occurred with a choke tube they don't even sell. I'll be surprised if they will be willing to go very far with a fix.
The Valmet 412 rifle bbls can be ajusted for both windage and elevation, so i've not had that problem before...
BTW, none of the Savage combo's i owned would shoot both the rifle and shot bbls together and to the sights!
DM