It appears there are some growing pains with this card and certain kernels causing lots of headaches. There was a good post over at the Aircrack-ng forums that suggested to replace three files..
drivers/net/wireless/iwlwifi/iwl-agn.c
drivers/net/wireless/iwlwifi/iwl-sta.c
drivers/net/wireless/iwlwifi/iwl-tx.c
related posts:
hxxp://forum.aircrack-ng.org/index.php?topic=4217.0]Intel Wireless Wi-Fi 5100 Card injection OK
hxxp://git.kernel.org/?p=linux/kernel/git/linville/wireless-testing.git;a=commit;h=84e8e77f618f589316e83dfa1bf afe5a47bf0bd2]git.kernel.org - linux/kernel/git/linville/wireless-testing.git/commit
Simply replacing those files fixed all my issues with the iwl5100