That's because unfortunately they don't have a resolution and will say it's totally normal. The only "fix" they have is the radiator brackets and software which is about 10 percent effective.I have a 2020 CX-30 as well. 10000 miles. Vibration since day 1. Does it around 50-60 mph and again above 70. Have a complete set of different wheels and tires. No change. Dealer has spent considerable time with no resolution.