This feature of DCs is not ideal as you've found out.....
It would be great if you could just move them about somehow.
......
Until this time / Google fixes this feature, you could try this ....
I start all attribute names with a1_ , a2_, etc then b1_, b2_ etc
All the "a's" are related, all the "b's" are related etc ( a way of grouping them).
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See
http://forums.sketchucation.com/viewtopic.php?f=289&t=18545
and
http://forums.sketchucation.com/viewtopic.php?f=289&t=21350
.........
Hope this helps
Howard L'