Inconsistent DAS performance ESXi 5.1

I am trying to set up a series of performance tests to run on 4 vms on a single host.  Using various settings I have been able to get CPU and RAM to perform consistently across all vms, but not disk.  We are using a test that writes out a 50,000 line log file and deletes it, but the time it takes to do this is never consistent.  Each VM has IOPS limited to 600 in config and is using a thick vmdk.  The disk can be slow, it just has to be consistent.  What can I do to ensure that all 4 of them perform the same way every time?

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