I have a few questions for you. In your first post you listed the following:

.3 FC
7.6
80 TA
liner pool indoors

Is that a typo or do you have 0.3 ppm FC? Did you mean 3 ppm? Also, since you have a vinyl liner instead of plaster/gunite, do you have any added calcium in your pool? You clearly have added carbonate as represented by the 80 ppm TA and your pH is at 7.6. Because your pool is indoors, it has 0 ppm CYA, is that right? Or do you have CYA because the SWG requires it and if so, what level is it? There are pros and cons about having CYA in indoor pools, but that's for a separate discussion we can have later.

One thing you might try before shucking the SWG and salt is to get to calcium carbonate saturation for water balance. It is possible that with enough calcium carbonate, that corrosion of metal could be inhibited. This is generally true in non-salt water situations -- I just don't know if it will also help in this saltier case. To know what level of calcium you should have, I need to know if you've got any CYA (probably not), if you've used Borax for raising pH (probably not), the salt level or the TDS level (or both if you know both), and the temperature of the water.

Richard