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My car is pretty low on b14's, running 2118s and I only scrub slightly on the arch liner on very tight corners when gunning it. No issues on touching the bracket at all.
Not been on track to say it wouldn't be worse, but it's been fine for way over a year on the roads.
You plugged the car in at all? Any codes?
Be interesting to graph the lambda and see what that's doing. Aren't coolant sensors known to reduce BHP too as it's not properly coming off the cold map?
Can you borrow a snap-on diagnostic from anyone? They're pretty good at showing your airbag fault location. Abs wise, just spin the wheels and check the sensor resistance first