Alright, now I feel stupid. ;)
Luckily, I was smart enough to make a backup of my 'working' fsuipc.ini file.
I tried the JoyIDs utility before, read the FAQ post...
However, before, I swapped id's just a couple of blank spaces below (which probably had something in them, although not showing, my not connected controllers probably).
This time, I just swapped with the very last id, got a confirmation message (hadn't seen that before!), and now it works...
Still not sure why it shows 2 X-55 sticks. I only have and have ever had a single one. Not too worried about that though, a