You want some of this?
My guess is that the sub-rail angle is not right on those tables. In hindsight I think I wish I had put Superspeeds on my GC but when I had my rails done everyone and their brother was installing Artemis so thats what I used. I can not fault the Artemis cushions on my table one bit. Since my table is in the basement I often get to play in humid conditions in the summer, if anything I think my table slows down a little rather than speeds up in high humidity but the difference is minute.
I have the same experience as you, as mine is in a basement as well.
The subrails on mine were tuned for the cushions.
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