Embrava is 6/tick regain at 500 enhancing. It's difficult to get 500 on SCH outside of abyssea (Atma of Harmony is +10) but it's doable with merits and certain specific pieces like Rubeus Boots, Argute Gown+2 Enlightenment augment, Kirin's Pole with Genbu Scrap augment, etc. 500 is the cutoff, it was 5/tick at 498 enhancing and 6/tick at 501 (suppose it could be 501 but I'm gonna go with 500). Was 72/tick regen at both 498 and 501, which also supports the equation that's on BG Wiki.