Attention: TDR Forum Junkies 
Not saying this fixes it all, but make certain your body shop is doing the best they can with the application of the epoxy primer. I think you should have two coats within flash time on either well-adhered old paint or bare metal (80 grit scratches need to be there in either case). After the two coats of epoxy primer, a 2 component primer (aka, 2k primer) should go on, then another coat of epoxy primer. Most body shops will not do all of this. Southern Polyurethanes describes how the process should be done.
For the doors, I think the salt/water compound must be stopped from reaching the bottoms of the doors. Once the mixture gets down into the lowest part of the door, it has no way of getting out. Either 3M or Lord Fusor may have something that may be appropriate for filling the bottom of the door to keep it from getting wet. Of course you'll need drain holes higher up if you do this. With the higher drain holes you can watch for rust forming which otherwise could not be seen at the bottom fold of the door skin.
I like the idea of spraying down with oil.
For the doors, I think the salt/water compound must be stopped from reaching the bottoms of the doors. Once the mixture gets down into the lowest part of the door, it has no way of getting out. Either 3M or Lord Fusor may have something that may be appropriate for filling the bottom of the door to keep it from getting wet. Of course you'll need drain holes higher up if you do this. With the higher drain holes you can watch for rust forming which otherwise could not be seen at the bottom fold of the door skin.
I like the idea of spraying down with oil.
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