Stephen,

Not a suspension expert here.  Hopefully, one will provide more info
soon.  But until then, I think you can be reasonably certain it's NOT
your shocks.

Unless they're starting to freeze up or something nasty like that,
they will not affect the static condition (sag) of your suspension.
And you haven't described any symptom which would point at the
shocks.

Of course, I've been wrong before.  I think it was back in 1967 ...

//Jack