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It is odd that you don't pick up 31.1 on one of your TVs. All of your signals appear to be very strong. So strong, in fact, that I would recommend against using a pre-amp. This much signal would cause overload on most pre-amps. If you have any kind of amplification in the setup now, you might want to try taking it out.
Also, which direction is the antenna pointed? If your attic as ducts, plumbing, metal bracing, foil-backed insulation, or any other conductive material near or in front of the antenna, it may take some trial and error to find the optimum spot within your attic for best reception. There may be material (sometimes hidden) in your attic that is altering the antenna's performance.
You signals are generally nice and strong. It may just be a matter of moving your antenna around a little bit until you find a sweet spot that picks up your missing channel.
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