Last year, thanks to over-torquing, the vibrations grew so bad I replaced all the rotors (after trying to live with it for six months). The next day I bought a torque wrench.
The chain where I bought the tires offers free wheel rotations, so now, as soon as the car is back in the parking lot after a rotation, I loosen every nut, then give the wrench a workout. A hundred kilometres later I do it again, all of it a real pain in the winter — and elsewhere.
I'll never buy tires there again. But now, because of the wrench, I don't have to take any tire shop's word for it — and I won't.