Are you building DNG files before ACR adjustments? If so, I'd wait.
I am now. Now that I'm getting more familiar with a workflow similar to what you outline in your book, I'd just as soon put my Kodak DCRs away and work with DNGs as early in the workflow as possible to keep the number of files/folders I'm pushing around to a minimum. I apply Camera Raw defaults and basic metadata before DNG conversion but more precise tweaks to camera raw settings (especially crops) always occur later as I prep files more precisely yet before proofing for the client. Yes, I open multiple similar files in Camera Raw and apply settings. I was just not preparred for how much having the embedded JPEG update would slow the process down.
The suggestion to export settings seems to be a decent answer. That allows much faster editing then I can export setting on a whole folder while I move onto some other task