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Do you have any recommendation on grease viscosity? Good old Sheldon didn't prescribe any specific grade to use but though he did urge active riders to repack multiple times a year!
I packed this Duomatic with ceapo NLGI grade 2 / 110 mm2/s "Universal Grease". It's now -5 outside and the stuff is already pretty darn stiff, though the hub is still in unridden condition. The grease claims to be good down to -30 °C.
I also have used the same grease on two open brearing casettes and had problems of it migrating to the freewheel. This manifested in me losing gear any time while coasting and then needing to carefully rev match to get the freewheel bite again. The problems only exacerbated with spray oil.