Probably not much help, but I'm weaning DS at the moment to one feed per day, sometimes only one every two days itms. They can get quite big and heavy, but haven't been getting sore - BUT I am still feeding DD (10weeks old). But I have noticed my supply is adjusting to feeding only DD and my boobs are settling to a fairly 'normal' size between feeds

Like I said, probably not a lot of help, but it shouldn't take too long for them to settle down