I never have in the past. Car usually is stored 4 months during the winter. My old BFG's used to flat spot easily, but would be fine after 5-10 miles. I have the same tires as you now and just pulled mine out of storage last week for the first time after sitting 4 months for a drive, and I had no vibration. I do however air them up to 35-40psi when storing the car to help with that.