Ok, so I have a few updates on my progress so far.
1) I was able to get the "@compName" token to work with the file correctly.
2) The "Unattended Join" piece was passing validation but not joining correctly to AD so I've taken that out and I am using the built-in task in SMP to "Apply system configuration" after image.
3) The command to enable the local admin account was running but the admin account was still disabled after image and sysprep was applied so I've got SMP running a script after image deployment and sysprep to enable it.
Basically, using the work-arounds I've mentioned above we are going to move forward as they work flawlessly so far in my test environments.
I think there are some issues when using Win7 SP1 with WAIK but I'm not sure. Everything looks 100% correct and there are no errors but not everything works as it should.
If anyone is or was in the same boat as me, please let me know and I can elaborate further on what/how I got this fully automated image running.
Thanks everyone for your replies!