Yours sounds like a case of a bad 300 ohm to 75 ohm matching transformer on the UHF antenna: Winegard seems to have gotten a batch of bad ones, and the big increase in signal quality between the amplifier and non-amplified signals on the LI PBS stations makes me very suspicious.
Also, if you are seeing WFSB from Hartford, remember that they are on the same RF channel as WCBS in NYC, channel 33. It may very well be that you have something not indicated in your TVFool.com report blocking the NYC stations, but my first line of attack would be to try replacing the matching device on the HD9095P and see if that helps you, then raise your antenna height.
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