After many days of trying all sorts of Solar Assistant (SA) configurations and cables plugged into many different ports I finally got SA to show all 4 batteries in my pack yesterday. (mainly thanks to Ryan as he mentioned ModBus was supposed to be what works on a call) Everyplace I found mentioned using USB JBD... That gave you just one battery in the pack.
I tried a RS485 Cable purchased from Eco-Worthy (on eBay). Plugged it into the RS485-1 port (leftmost) on the 1st battery in my Pack, Then in SA I set the battery to be "USB Modbus RS232/485" it almost immediately found it and connected and showed my all 4 batteries in my pack. Of course I had to pick the correct connection for that USB to RS485 connection in SA.
Hopefully this helps others keep more of their hair intact.. I have also documented this on DIY Solar forum and Reddit.
-Bill