eibgrad
Part of the Furniture
I'm still pretty stuck. If you'd like I can upload more SSH outputs. Tell me if I can give you more information.
Should I run those commands both with and without Dual WAN enabled?
When I'm making *any* of my suggestions regarding this problem, it's my assumption that you have *disabled* dual WAN, since the whole point of the effort is to eliminate it.
In fact, at this point, I would prefer you reset the router to factory defaults and start over, just in case the use of dual WAN has left artifacts that may be causing issues w/ my suggestions. I'd just rather have a clean slate.