If you had success with Vaseline that wore away quickly,,but know the spot, I would add an adhesive backed pad to the area and see if it keeps the area taut.
When I did post production work on brand new Camrys, we had a felt like pad that had adhesive on it we called mole skin. I don’t know the real name for it, I believe it was a 3m product. We used it to hold wires added for things like security systems, auto dimming mirrors, etc. it was thin, not an eighth inch thick. Maybe a heavy sixteenth thick. It was like a 1.5x2.5 piece.
I’ve heard in my old car resto forums about guys using Velcro to stop rattles from dashes and such. I’ve never done that. Seems logical that might adhere to a spot and keep it from moving.