Welcome. Time will tell on decreased slipperiness. I don't mind it as I don't find a problem sliding forward and like to be able to move around easily. I am sure Suzy could address whether a given material would be slippery. The blue carbon has that shiny finish, also slippery.
Thanks for the update. I wonder if the seat cover will be less slippery as you ride it more. I took the OEM seat off my GTV and put a GTS seat in its place just to avoid constantly sliding forward.
Also, clothing will surely impact that as well, the pants I was wearing are thin and smooth.