Are you talking about counting supralabials in the three pics that you last posted? It's a bit difficult for me to count from those pics. I can get a count on the first pic...I am saying definitely 8 supralabials...definitely a checkered...a T.marcianus. I am having trouble counting from the position of the head in the second pic...but I think I am counting 7 supralabials...if I am, then I will say an eastern....T.s.sirtalis. I think I count 8 supralabials in the last pic...which rules out eastern...so I will say a radix...T.radix. Thinking about what you have said...about the face of the radix and how they can look like a marcianus...and looking at that last pic...if I am correct about that...then I will agree with you that your snake is most likely a T.radix.