It sounds like it may not be related to the steering wheel, in that case. Are you still under warranty/is getting the dealer to look at it an option? Alternatively, I know VCDS gives a lot of module testing capabilities, if OBD11 has similar it may be worth investigating the module that controls cruise control.
Since you have a '17, do you have the early or late style? Is it possible you've got an issue with the ACC sensor? I'm told (by the dealer, so grain of salt and whatnot) that anytime the bumper/grille is off of the car the sensor for ACC needs to be recalibrated, not sure how accurate that is but that could potentially be related.
Again, sorry I can't be more help, and I'm probably retreading things you've already looked at, but just so if someone smarter than I (very likely) sees this thread, they could chime in based on what's already been ruled out.