On our first night of progression on this boss we were getting to the 3rd door consistently but then had a bit of trouble trying to get to the 4th on a constant basis. This prompted us to switch up our strategy so that we could go into the 3rd door a bit better off. What we normally did (when we reached 3rd door consistently) was focus the venom priests/effusions and then go to the blood lords which believe it or not is harder on heals since the lords hit like trucks and leave a dot. So we decided to swap this priority and just make sure we burned the first priest down asap, then make the bloodlords priority if no effusions were up. This resulted in a night of wipes and people yelling at each other because the priests weren't getting interrupted on every single cast. Of course as soon as we go back to the original strat we get to the 3rd door but then come to the same problems. I am not looking for a "hey just do what you did first" because that didn't result in a kill and we are pretty sick of this boss already. I have our logs below and would appreciate something a little more in-depth.
Logs from first week; Venom priest focus:
Logs from this week; Blood lord focus: