I just tried this for the first time last night, in the DF. We gave it a good try but never got it below 30%. As whm, I found it incredibly trying. Every time we tried I would run into mp issues. And I know I'm good with mp conservation. I don't know if my party was doing something wrong or not but I was having to absolutely spam medica after 50%. Since there's no reason to try really I'm not gonna bother going back.