Tami,
How about this?
With all the labels in strict stacking order (first at bottom (or at top)), and based on the top right:
1) Position the first label as desired;
2) With the first label from as key object, align all the labels to top right, then lock the first label;
3) Move the set right by the desired distance (that between the marks), then lock the first of the remaining labels, and repaeat until all are moved.
I believe you can use action/script to make it easier, and I beieve one of our actioning/scripting friends can give a hand.