News!
Yesterday I swapped the rear wheels for the fronts and viceversa, and the vibration went from "**** this car is unconfortable" to "not that bad but the steering wheel will fly away from my hands"
I can tell for sure it's a wheel issue, and presumably a wheel installer issue, as a closer look on the balancing weights, with up to 75g, doesn't look that great.
I will take the car to another place, and ask them to check both if the rims are still a circle and to rebalance them.
