Perfect! Thank you!
There's nothing to do but wait on channels that don't have matches for either HD or SD is there?
If the EPG source does not provide any data for the channel, either SD or HD, then the only way to get the info is to use other methods instead of, or in addition to, the default method.
For example, you can setup over-the-air EPG method (for North American users only for now), and enable the option "In Over-the-air EPG scan (ATSC only), save programs for channels with empty XMLTV IDs only". Then you can run both mc2xml and OTA loading modes. For most channels, you will get the data from mc2xml. For the channels that mc2xml does not provide data, the OTA scan will provide some data (usually incomplete).
There are other options, such as third-party XMLTV data.