Lines are super tight.

[Greenbacks]

You have 8 lines that are -3.5 or less
Chiefs -3.5
Saints -2.5
Lions -2.5
Texans -2
Titans -1.5
Colts -1
Steelers -1
Ravens -1

 

[Loves2kickass]

You have 8 lines that are -3.5 or less
Chiefs -3.5
Saints -2.5
Lions -2.5
Texans -2
Titans -1.5
Colts -1
Steelers -1
Ravens -1

Short lines don't tell you anything. Formulating your own lines that are close or even with the book number makes a line tight. A spread could be -7 and tight, unless I'm misunstanding you