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I don't believe that the gain is too high, since if I was overloading the tuner I'd expect to see the signal strength pegged at 100.
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Nope, it would do the opposite. It would tank. The "signal meter" doesn't measure the power of the signal, it indicates the quality (in terms of bit error rate) of the signal. An overloaded tuner will have a very high error rate and will consequently display a low meter reading.
Most likely, your issue is the trees combined with the attic location.