Oddly enough (or maybe someone else can explain) my issues seem to have straightened out after I changed my tablet’s WiFi to stop using a randomized MAC. I thought I had already disabled that and told it to use the actual hardware MAC but I hadn’t. I see how that could have affected the FK add-on in HA since I had set it up with a DHCP reservation but somehow it’s caused the white screen issues to stop happening.
Hope someone else finds this useful.