I'm noticing a couple of things that are out of sorts.
First, you FC is too high for your CYA. Were you super-chlorinating with the SWG or otherwise trying to shock chlorinate your pool?
Second, your TA is very high. At 180ppm it is going to cause your pH to rise quickly.
Third, based on the numbers you have provided, your CSI is +0.36, that is scaling territory. When you operate an SWG pool, you want to maintain a zero to slightly negative CSI, somewhere between -0.1 and 0 (you can go all the way to -0.3). The reason being is that the pH inside your SWG cell is much, much higher than your bulk pool water. The pH inside an SWG cell when it is generating chlorine can easily go up to 11. So, if your CSI is already very positive before the cell is running, it is going to go up even higher when the cell is running. This will cause calcium scale to build up on your cell plates and is very likely the reason why your cell is asking for more salt. When an SWG cell plate gets scaled with calcium, the effective surface area for generating chlorine decreases and, from the standpoint of the electronics, that looks like the salt level has decreased. This is a common error made by SWG owners - they see the low salt alarm, add salt to compensate and the problem temporarily goes away. Then more scale forms, they keep erroneously adding salt and, the next thing you know, your pool water has too much salt in it.
So please try to lower your TA and keep your pH in the 7.6-7.8 range. Getting your TA below 100ppm and closer to 80ppm should lower your CSI to an appropriate range. You will also want to pull your SWG cell and check it for calcium scale. If the plates appear to be a whitish-grey, then they need to be acid cleaned according to the manufacturers specification.