The problem with this doctrine is although it is the weakest of the suppression effects of the game, it is still penalised by double conditional bc. Reapers also have to be within FoF. I think this doctrine, although popular, is pretty weak because I don't benefit outside of FoF. So maybe add the old effects of Reaper Focus, the vision range bonus in Heavy Cover + Stealth Cover, so I have some benefit outside of FoF? I think because the slow is so weak this should be included. The only other vision doctrine for Eldar is Ranger Focus and having the vision benefit would actually allow me to use Reapers instead of Rangers for bonus vision.