So I tried iwayman 1001's suggestion, and it did work, with one caveat.
I was able to tune in more channels to MC, and I was able to find all the main channels I watched before + several more.
However there are two channels which, tuned to the ATSC channel number, broadcast at lower resolution than the QAM channels I have tuned. 1080i or 720p vs. 480i.
There is no setting in the HDHR setup software that allows MC to tune the original QAM stations I had tuned in AND the new ATSC stations that I've added. You have to go back into the HDHR software, change the setting between J River and Other:ATSC/QAM i order to tune in the two different sets of stationsl.
So it seams the tradeoff is: More channels and watching survivor in Standard Def 480i? (potentially can stream survivor off of Xfinitiy online or CBS website) or fewer channels and get CBS in HD.
This could just be a local Seattle thing though.