I think I may have found the bug. I left off the .171 offset to the real chamber center from the wire average. Thus instead of 8.414 I should use 8.585. This isn't enough to account for the 3-5mm shift I see wrt Celso's monitored chambers, but it is in the right direction.
Modified 12-July-2010 at 12:53
http://hep.physics.wisc.edu/~jnb/cms/12Jul2010
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