I can answer some of this. lol
I didn't compare the decks before building the Mini. Eitherway, it didn't seem that much of a difference - but I could be wrong. One thing I noticed is that the wick channels are bigger, or at least they seem so as the deck isn't so high; when I build the goblin, I always catch some resistance from the wick when I'm screwing the base of the chimney. On the mini there was no such thing.
Been
vaping the Mini all afternoon and there was a little bit of condensation but nothing worth worrying. I'm
vaping with the airflow almost on the Min, which can change somewhat the condensation level.
Leaks - none.
I'm really loving the Mini. It is really, really a good idea, turned into a very good product. Youde is nailing it these days.
Also, a note: this thing rocks with Clapton dual coils on the Ego One. It's a match made in heaven!