Finally got the car running with a little wastegate duty cycle and the roads are not icy anymore. Only thing I've adjusted since last time is I turned the threshold from klock 9 to 10 so it would trigger the spray later AND IT WORKS
WL/WH is still in end positions but the main thing is the system is working.
I'm not sure what was the trigger that activated the failsafe before. Basically it activated before it even got to start spraying so I quess it was just spraying too early even the IDC wasn't that low.??
I want to thank you Richard for all the support you've given. The whole installation/adjustment has been full of mysteries and things have worked the way they shouldn't or just differently compared to other Audi S4's and this made it more than challenging.
Hopefully this thread isn't going to be re-reopened
Thanks