Got my leak fixed at the EGR, lean code came back, but vacuum was better, no obvious malfunctions like I had with the blend doors and stuff. Hooked it back up to a smoke machine, found a leak in the plastic hose that routes behind the engine that connects to the fuel pressure regulator. This would create a dual problem, a vacuum leak combined with constantly elevated fuel pressure. Anyway fixed. When inspecting the vacuum lines, make sure to check the tube inside the split loop tubing.

Now I am just waiting for my DPFE sensor to show up. My old one I guess failed because of the backpressure from the clogged cat I had. Ever since I replaced the cat the P0401 has been popping up.