You can try the Contact info(Phone#'s etc) listed on their website -- :http://www.nbc22.com/feedback/index.htm
Last year around this time, WKEF-DT came on the air early for HD olympics, and I DID have some luck getting them to switch to HD via a call to their Newsroom on a Sunday afternoon, although it took a 20 minute converstation to do so, and they wouldn't switch me to engineering or master control. At the time, a large Logo on WLWT-DT over the ski-jumpers speed info was bothering me
Another way to address WKEF-DT/WRGT-DT issues, is via the email address given at the following page, which is the site of the company that owns WKEF and I believe has a LMA for WRGT, Sinclair(note, I have had some luck using this email address as well) :http://sbgi.net/dtv/
Perhaps, for TWC subscribers, contacting TWC(If you can get hold of someone who actually knows something about DTV/HD), may be of help/use as well.
Although I certianly would like to do so, I don't feel comfortable sharing more "personal" contact info without permission from those involved.
In order to "get through" to WKEF/WRGT on previous occasions(some of my "findings" on various issues are posted much earlier in this thread), I ended up having to go through a corporate person at Sinclair Broadcasting, who is(or was) an AVSforum member.
Many times, if stations don't hear from viewers when something is "wrong" (No HD for example), they assume that noone is watching(I'm not necessarily referring to WKEF-DT). Granted, IMO, this should have NOTHING to do with how they operate but sometimes it does.
Thanks for trying and good luck -- I think if they get a "ton" of phone calls or emails on HD via their "standard" contact info, it would be a good thing, and that they would take notice.