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I think your Warp 8 figure for Defiant is also in error. According to "The Sound of Her Voice," Defiant could hit Warp 9.5 by siphoning power off of the weapons. IIRC, the warp 8 limitation was under cloak -- any faster and they risked detection.
EDIT: I sort of feel like this discussion has wildly hijacked poor jrhottel's thread. Perhaps we should migrate it elsewhere?