"the theory was/is that SWG manufacturers usually recommend about 3000 ppm. Some of that salt is tied up when converted to chlorine, leaving a smaller part as true salinity. Therefore, putting only the amount in that would match what is present in an SWG pool minus the converted amount would most closely replicate the feel and ability to taste salt in SWG pools."
Very little salt is consumed in the process of producing chlorine. The higher salt level creates a conductivity in the water that is needed to pass the electricity within the cell.

"Does anyone know how high the salt content needs to be to keep the water freezing? Are there any real pros or cons on whether or not your pool water freezes during the winter? I am in New England where it gets pretty cold in January..."
At 3000 ppm, the water will still freeze but instead of 32 degrees, it will freeze at about 30.7 degrees. No significant difference.

"The pool is 9000 gal gunite in Hawaii, at an elevation of 1000ft so nowhere near the ocean. The salt measured 400 ppm before putting in additional salt to raise it to it to 1400 ppm using Ben's calculator. Now several weeks later a Taylor Saltwater kit is showing 3000 ppm (15 drops)? But TDS is registering 1800 ppm when it was 560 ppm before. This is weird!"
hmmm, bad reagents or incorrect testing procedure. It's impossible for the TDS to be lower than the salinity. Salinity adds to the TDS reading. There is nothing wrong with maintaining 3000 ppm of salt. When you get into the higher salinity levels of 6000 or greater, it can cause corrosion to metals in the water.