in the meantime i dont have the 3g, do you still recommend putting it at 3g ?
He didn't recommend setting VTF at 3g. He recommended setting VTF at 1.8g whether you have the 3g headshell weight or not.
IME 1.8g is a good starting place for a Shelter, but fine tuning by ear is necessary, as with any cartridge.
P.S. Shelters are sensitive to changes in temperature and humidity. You'll need less VTF in hot/damp weather, more VTF in cold/dry weather.