Glad it works! I don’t have all the options on my spa either, but figured it was easier to have them all available and then refine it in a future update. There are another two calls that I’m aware of that I haven’t implemented yet which seem to indicate which pumps/lights/extras are available for the particular spa in use: “DeviceConfiguration” and “SystemInformation”.
As far as my WiFi module goes, it has stayed connected basically all the time. I think there have only been two times it’s disconnected since I got it at the end of October last year. It’s the exact model that you linked to and the stickers on mine indicate it is 50350-06 V2.20.