I would avoid the use of the CM-7777 given the relatively strong signals present. The CM-7777 is intended for use in areas that have no strong signals. An overloaded amplifier will reduce the quality of the signals leaving you with less reliable reception.
Have you tried completely removing all parts of the amplifier from your system?
Have you tried testing reception with the existing CM-4221 outdoors, clear of the interference generated by equipment in your home and the attenuation caused by your roof construction? I would do this before spending money on another antenna.
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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