Solly, I don't know what percent moisture content trichomes have either.
I don't see any mechanisim that would increase the BHO yield using wet material though. In fact the yield by weight is much lower using wet material, because the heavier wet material still has the same amount of trichomes as the lighter cured material.
I come out about the same if I adjust for the (10/15%) lower water content.
i didnt find a higher yield wetted, but its possible that the extraction could be more complete that way, extracting more of what you want more easily i believe was the idea, but it proved fruitless.