Helwyr is manageable for me as long as the mushroom spawns aren't BS. The bug where wolves stop spawning ruins the fight though, makes it that much more annoying because I end up running around more often.
Greg's awful unless you've got venomblood and can just camp the north mask. Constantly running into melee distance is easily the most frustrating thing there, but turning off run helps deal with that (or using a ranged weapon ...).
E: Bought some essences, 350k per zaros, 180k zam, 690k slisk, 810k seren
This t85 gear is basically 65% of the cost of malevolent, 40% of tectonic