I also didn't know why the external load was 0ed out? Not sure what affect that would have? I would say fix the vacuum leak caused by the breathers,...
Copy that and yes no rear o2's. He has those Valve cover breathers going into a filter to atmosphere. One thing I didn't try because of a brain fart...
I can tell you from personal experience that none of the changes you're planning on making or doing a fluid/filter change will require use of any of...