Craig, you are too nice.

Get on Portal, at least (it is free), and that should take of some of that BS. You can easily throw a proposal together for - Prewire, Product, Finish labor... whatever. Throw some language in the notes, or your contract, whatever works, and sell it as all or nothing. You're a turnkey, service-based guy - sell it that way. That will also weed out the not-for-you prospects that are looking [craigslist] wiring only.