I think I just realized (hopefully) the main issue you were describing. I think one can look at one side isolated, and in the attached image I have colored the shorter spokes magenta, the longer yellow. One can see that all yellow spokes when tensioned will strive to turn the hub clockwise, which then need to be balanced by the shorter spokes which turns in the opposite direction. However the shorter spokes is less tangential, and thus to counteract they will need more tension.

However due to my limited experience I don't really have any idea how large this effect will be. The shorter spoke is 111.45 degrees and the longer 106.26 degrees (where 90 = perfect tangent), a difference of 5.19 degrees, which to my intuition does seem as it could be significant. Even if it is, it should be possible to balance out, but how hard is it?


One side (12 spokes, 18 holes) with 2.5 degree offset. Yellow = Longer spokes, Magenta shorter spokes.