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I see two problems.
First, the problem with CFTO is caused by FM overload. The strongest FM station is on 94.9 MHz, which causes s spurious signal in channel 9 when preamp(s) are used. The solution is an FM trap between the antenna and 7778 preamp. The Antennas Direct FM filter is a good choice if they are still available.
The second problem is that unless your leadin is longer than 100' you should not need both a distribution amplifier and a preamp. Receiving more channels with the distribution amp in place is an indication of a bad splitter or excess loss in your coax.
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