Thanks for posting your TVFR, the information is essential for understanding your situation.
KPIX is broadcast on UHF CH-29. It is not a VHF signal despite the confusion created by virtual channel numbers. I would expect the ANT-751 to have no trouble with reception of UHF signals 20 to 30 dB lower in level... so, have you tried connecting the antenna to a single TV, no splitters, no amplifiers, no used coax... just the antenna, a known good coax and the TV?
An amplifier should not be needed even if you do an 8-way split... An overloaded amplifier will cause more trouble and not resolve the current problem.
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