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1. Try adding a VHF Retrofit and see if it helps with your ABC station.
2. Fox is one of your strongest stations and should have plenty of signal power for long cable runs and splits. That you're loosing it with only about 5-7 db of additional attenuation in the downstairs path vs the upstairs path suggests that there's a fault in the cabling, splitter, or the TV itself.
Quickest way to troubleshoot is to run a temporary coax straight from the lead in (at the grounding block would be convenient) straight to the basement set and see if it works. If it does, then start rebuilding the distribution network a piece at a time and see which element cause the loss of reception.
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