You defended your assertions with logic, reason & specific examples. What you say makes sense, too.

I'm really grateful for your reply. You added to my Milk snake species knowledge.

The local pet store owner thought that I have a Sinaloan cross. As a final analysys, I'm thinking that what I likely have is:

Nelson's or Sinaloan x Guatemalan or Honduran
(with nelsoni/sinaloae traits predominating)