Brian,
I to have not been here for a bit. Where the dash has changed its shape is from heat, time, and the vinyl shrinking. Is your dash wrapped or is it factory foarmed? Where it is warped will need to be reshaped and new foam installed. The foam under the the dash has a form then the vinyl is heated into shape. The old foam has learned its new shape and will not return to its original shape even if the old cover is removed.
Mark

Hey, Mark.

Thanks, yes my dash is leather wrapped. This helps.

Brian