Sag has many potenential sources, all of which are covered in the FAQ.

As for teh trim, I imagine you are taloking about teh seal that goes around the edge of the outer sunroof panel? When I reinstalled it on mine I shot some silicone (you can also use epoxy) into the crack that slips over the sunroofs edge. I then firmly holding it in place for a few minutes until it has a chance to dry. This helps to keep it from sliding down when the sunroof is vented or moved (it can't hold itself on with friction alone).

good luck,
rt