My go to ambient music is saxophone driven smooth Jazz. Anything Boney James. I prefer the saxophone (alto, tenor, soprano) over synthesizers. For reasons that escape my understanding, when I listen to synthesizer/electronic driven music/melodies I get sleepy. If the music is driven by a saxophone I get extremely relaxed but my mind stays alert. On long road trips with kids pushing buttons, I'll put on the Boney James - Ride cd and my wife just looks at me and smiles as we know the kids will be silent in minutes. It is really crazy how that seems to work for us.
Having said that I did enjoy listening to the artists shared by you and others on this OP. I think I would enjoy this music more when working outside in the garage and not sedentary.
Art Pepper, Miles Davis, Coltrane, Frank Morgan.
Jazz is my ‘chill out’ background music.