I want to give an update, after hours of trial.
The first problem isn’t a problem anymore.
It came through a misinterpretation of problem two.
The SSD is running in AHCI mode and btw. I have seen a tremendous gain in performance.
Second problem still exists.
After a cold boot, the SSD is not recognized.
Need to warm boot afterwards and the SSD is running until the next cold boot.
Third problem seems not to be something to discuss here.
Will forward this question to another forum.
So if anybody has a solution for my problem #2, that would make me happier.
