I don't really know many DJ's that perform in odd time signatures, but from what I've heard Bassnectar does some pretty triptastic things. I think it's all still 4/4, but there sure is a lot of leeway in the beats. But then again, it's dub, so there's the reason. If you want an example, skip to around 1:10 in his Seek & Destroy Remix.
My personal theory of why 4/4 is the most common time signature is because most people conform to an even, symmetrical normality. Musically, 4/4 is symmetrical and balanced (There can be a certain degree of asymmetry within the 4/4 such as with the Bassnectar song up there, but I digress) and most DJ's try to keep a "Flow" about their work. When you go into an uneven time signature (3/4, 5/4, 13/4) it can melodically sound great, but the uneven "flow" causes our brain to notice the skewed, unbalanced nature of the song.
Aaaanyway, good luck with it. Sounds like it's gonna be super interesting :)
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