A thought on the glue and leather ! I do not think that using a real strong glue will make a great deal of difference .
Certainly a high temperature one yes will help.
Leather is a bit like skin in fact exactly that
and when exposed to excessive heat will brake down and shrink over time .
Unless the glue can fully penetrate the whole thickness of the hide it will most likely always pull towards the most secured part of the bit it covers .
And in turn will rip its self away from what ever surface it was once stuck to when it shrinks.
By doing this it de -laminates and leaves a bit of its self behind on the surface it was once stuck to .
If re covering a piece its better to allow a good overlap margin to accommodate the shrinkage,This would seem to have been over looked in the manufacture! and may be some thing to bear in mind.
My dash dome like yours brasses me of the most about the car and is such a small but common problem.
Good luck have fun ,cheers. Mick