Well, after 6 weeks (!), today for the first time I’m starting to feel that the coil and cotton need changing. It’s still not bad, but it’s not like it was before. Besides the VG, what else changed in the last build was that I reduced the cotton length to the minimum (it just barely covered the opening it needed to cover)… maybe this also mattered.
And about condensation, for 6 weeks I never took out the Boro to wipe it… and nothing ever leaked from under it!.. obviously there will be some now, but after this much time, this is pretty much in the miracle category.