Unfortunately I wasn't able to fix it, had the whole thing apart and I think there's some kind of intermittent signal or motor failure. You can see it auto-adjust when the ignition goes on, but it doesn't wipe properly, it will just move position once each time when you turn on the wipers. I disassembled and reassembled it multiple times trying the cogs in different positions and tried to bend the electrical leaf contact thing more but that's the best I could get it to perform
I've now ordered a second hand one from the USA so it's going to take a while to arrive..