Try Subtle's album, A New White (2004), Pedestrian.
Although, I won't deny that I suffer from the same problem that you do. I have yet to find a hip hop album that challenges me instrumentally, and there hasn't been any boundary-pushing material to come from the genre yet.
...or am I asking for too much?
(I like hip hop, by the way... I listen to it on a regular basis).
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