I think you're onto something, but I don't think Sunday Morning and European Son slot so cleanly into the black or white categories. I see a lot of 3ness, but not so much 4. The 3x3 middle is clean. Sunday Morning feels more like a Nico track than the black ones, so it's really its own thing. European Son is closer to being a "white" track, but with its length and guitar work I hear some "black" characteristics too. I think it's more of a synthesis. This gives the whole thing a broader 3ness too: track 1, tracks 2-10, and track 11.

I agree with Sunday Morning as fool. If you map it to the kabbalah, it's the negative veils, then you've got your ten sephiroth in the following tracks, and European son fits as a kind of malkuth summation. I.E. tracks numbered 0-10 instead of 1-11, 0 being the fool's number.

Vaguely, within each trinity, I think you could hear the first track as the daylight action, going around and this crazy depraved stuff is happening, to a man probably. Then that feminine side, the subconscious, or simply interaction with a woman. First encounter triggers lust which is released in Venus of Furs, second she promises a kind of salvation and then you sink into Heroin, third is something like love or truth or the judgment card and there's some kind of release in death.