I'm pretty sure your tuner is just missing something. But, I have to admit I have never changed it on an 05/06. I suggest you post the question on the HPT forum and see what happens.
As for the VZClustermod, go on LS1GTO and contact Vending1337 directly. I'm sure he can tell you. Or post in the VZClutermod thread. http://www.ls1gto.com/forums/showthr...7#post20498057