Did you clear the front drain hoses too? Is the cassette clean (no large leaves clogging it)? The rear hoses are pretty small and simple they're pretty much like a drinking straw. When I removed my cassette the entire area of the rear drain hose was filled with leaves and debris. No way that was draining.

I had water leaking in the front glove box that I fixed by running wire through the long drain hose in the front. If the hose is clear and properly attached I don't know why you're still having leaks. Are you sure the cassette and everything is unclogged .. I don't know.

I can see a leaf up there in the picture. It's probably like mine was. It was like an Autumn festival in the rear corners of that sunroof cassette. I had cleaned the interior really nice in days prior, drop the cassette and got leaves everywhere, had to do it again.

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'05 E53 3.0 6mt
'17 F30 340ix 6mt
'96 E36 328is, in progress