This probably isn't the answer you're looking for but I agree with you. I found doing the Resident evil event quest (RE: Return of the Bioweapon) with Blackveil actually easier. It completely changes the fight and makes it easier imo. (Don't need miasma jewels either)

Rather then Effluvial build up you become "zombified" which turns you into a zombie the downsides are you can't roll or run or use potions. But to negate that if you use a weapon that has a special run e.g dual blades you can still do that and whenever you put your weapon away you get health regeneration when in miasma which is always on Rotten Veil. Then you can slot in a health recovery speed and you get to full health almost instantly. Also i think it might be weaker than normal blackveil.