Here you can see my “wedge” I use for giving the board its rocker:
Currently I will only repair my first board since the wood is still great. It weights around 2,3kg without glass. at 35mm thickness overall strength is awesome I do not feel any flex when pumping. I cannot noticeably bend the rocker when standing on it with two people, one on each end, 200kg in total.
Since the “no dirty glass/ carbon” strategy did not work out I would probably reduce to 5mm deck/ bottom on 15mm core hollowed with one light layer of glass. The additional 5mm wood top and bottom on my current only where used to get in some cross fibers since planning without fiber glass reinforcement. Mounting points always glass ball filled through-holes - no track needed on a 84cm board.