This is something rather difficult to find, even soem of those you mention hardly qualify as mature shoujo-ai series. You might want to try manga instead, the yuri/shoujo-ai choice there is a lot bigger.
Anyway, I recommend Blue Drop, though it doesn't deliver much in the romantic department. If you are fine with shoujo-ai subtext only - check out Noir.
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'The world we live in is always in darkness.'
'Yes, and that is why we seek light.'
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