Just spoke with Rich Lohmueller at WLWT. He was very kind (must not have read my first post - oops! Sorry Rich.). I told him about the late HD video switching and the lack of audio sync. In response he asked if the audio was in sync on up convert NTSC programming, which is the correct question to confirm if my receiver is at fault. The answer is that upconvert video and audio are in sync. He said that he'd check it out this afternoon. He may need to request an action feed from NBC to confirm time sync once he confirms that they have the correct audio and video routing through the studio plant.
I also asked about their current ERP. He says that with the new transmitter and current temporary 3" feedline and antenna they are at about 125 kW. He can't push much more power or the small feedline may end up like the Lubbock, TX, DTV antenna that burned last week. He expects to have the new channel 35 feedline and antenna up sometime this summer.