Okay. Lot's of trial and error all day. Learned a lot on how things work, but not much on why they don't. Phone conversation with Apollo has me trying something tomorrow. I will update it once I find out results.
The idea of using the letter N design instead of M only partially resolved some issues. And created others.
In the morning I will remove the 2" pipe, replace with gutter and try apollo's idea of turning last 90 elbow parallel to the ground.
Barrels are dirty due to taking two years to build this nightmare of a project. Cleaning as I go.