think the trim sagging is a combination of both heat and moisture.
Over here in Australia almost all the 75s ive seen have sagging headliners and door panels.
Having re trimmed about 5 of these cars, it appears the glue they (and others) used was not great and dries and crumbles into a sticky goo.
It was sort like a thin foam backing with a glue that was pre applied to the fabric by the fabric maker or sprayed on in the factory and seems to have reacted with the foam backing.
When doing any panels with this glue on, you need to strip every bit of it off before re gluing.
I found a stiff brush with some detergent gets most of it off.
If your re gluing, use a high quality spray glue with high temp specs.
Headliners are lots of fun doing them by yourself!!
A pillars easy, B pillars tricky, C , easy, door panel inserts a little tricky around the arm rests.
Make sure the material you get is a stretchable foam backed material.
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