So Iast Friday I went to see the watchsmiths at the store to chat about my GF SOH II . First, they confirmed the movement is indeed a miyota movement (as advertised by TDs ) so it's not a chinese movement. Secondly, they acknowledged that the miyota movement can be noisy but it is just the way it is. The rotor cranks the spring in only one direction and is free to spin on the other.
The two recommended to not do anything on the rotor. The watch works perfectly and they said applying grease on the bearings could alter the function of the rotor and they didn't want to take that risk. They said if I didn't like the noise, they could simply remove the rotor which would make the watch fully manual. I didn't want that as I can live the noise.. it's not that bad after all and I love the watch!