Have you ever run the results of a fan leaf extraction through the GC
Someone here tested Harlequin fan leaves from when the plant was in veg. The test showed 4% CBD and 2% THC. I believe the flowers from that clone tested at 8% CBD and 6% THC.
My experience has been that edibles made with fan leaves feel roughly similar to edibles made with sugar trim or bud. You just need more weight in leaves to get a similar high. That goes for fan leaves with zero visible trichomes too. THC is produced in the leaves themselves, not just in the trichomes.