I finally managed to get a copy of the beta A07, and it did not fix the issue. After reporting this to Dell, they started asking what kind of network switch we were on, what kind of pxe server, etc.
Needless to say, we have 6 other Dell models, 3 Lenovo and 2 IBM that all image without issue.
Considering A01 works speed-wise, i'd be willing to bet quite a hefty sum that this is an issue with a single model and BIOS version, but I seem to have a hard time convincing them of that. We've already ordered a Fujitsu demo and will be ordering an HP demo as well. This has been a frustrating 2 weeks of this...