First, stop using Audit mode to configure the workstation. Yes, I know that's how you get the administrative account to be copied over to the default profile. But it's only one way, and it's un-necessary except in certain circumstances. The default profile can be modified in other ways that is better on sysprep.
Second, the unattend you put in is going to be overwritten.
Let me suggest that you under-think this to start with, and then try to figure out what's missing. We tried to think this process out pretty well for you, so you shouldn't have to work so hard to make a golden image, capture, and deploy it. Try, for now, the following:
Build a PC to look like you want it. Don't bother with Audit mode.
Install the agent.
Run the job you have to capture it.
Deploy it.
Keep it simple to begin with. IF that doesn't work the way you want it to, find out what is missing, and let us know if we can figure out how to get it for you. MOST of our customers don't ever use Audit mode, and the one that did had to do some fancy footwork to get things working. He did, but see if you can avoid the pain.
My 2 cents.