Stacking buffs here isn't classic because the dev's didn't have the original spaghetti code from Live. You should be able to stack SoW and chloro in such a way that fungal regrowth overrides SoW but leaves the regen up, for fungi tunic+fungi staff+regen. Bards get the real short end of the stick in being unable to stack anything they can cast/proc like multiple Tash's, Damage shields, Hp buffs, etc. There was talk about fixing it years ago but its never been fixed, though Haynar said it was easy to do.