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Preamps are only needed to compensate for the amount of loss you have in coax and splitters and pumping a signal that is already too high up ANOTHER 30db is never a good idea
The CM-7777 has WAY too much gain for a 50 foot run of RG6 and it's possible that the stronger local stations are desensing the TVs receiver and overloading the CM-7777
I just bought a CM-7777 to try and see if it would be any better than my old Winegard AP-8700 and the Winegard was actually slightly better than the CM-7777 so you can't always rely on all the hype and specs
The CM-7778 may have been the better choice for your situation
The massive Winegard VHF and the 8bay UHF bowtie are certainly the longest range antenna designs one could buy so can't improve much there
With as much as you already have invested I would recommend you call a local antenna installer who would have the field strength meters and expertise to find out waht's needed before you spendany more money
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