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Ah, I see you already have those.
Nothing newer to suggest, but worth exploring where it began (arguably) with The KLF and The Orb. You could go back further to Tangerine Dream, Klaus Schulze, Steve Reich but despite having tracks that were definitely ahead of their time, they crossed genres and weren't exclusively ambient, or would be classed as 'experimental' for the time.
Ambient Trance was really an early-90s thing, there's loads of the stuff back there - The KLF are generally credited with first using the term "trance" as a style of music. FSOL, Banco de Gaia, Orbital, System 7, Global Communication would be the main names to begin with.