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1) Is there any downside to using the FM filter? I can certainly try it.
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There is a small loss of about 1 dB, but you really need it because your strongest FM signals are about 6 dB stronger than your strongest TV signals, and about 40 dB stronger than W27AU.
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2) Could you comment on performance of an antenna in an attic where there will be snow on the roof (a foot or more) vs the roof mounted antenna where snow may get on it during heavy snowfalls. I am not sure what the better situation is for reception.
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I have no idea what the signal loss will be in the attic, with or without snow. You will just have to try it.
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3) One other consideration is cable length. I would have about a 65, 35 and 100 foot run from an outside antenna to the 3 tvs. Concerns with signal loss on those runs?
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The signal loss for RG6 coax is about 6 dB per 100 feet at UHF. Try it for one set, then add a splitter.
You can cascade two 2-way splitters for three sets to get more signal for the longest run.
If you still run out of signal replace the passive splitters with a Channel Master 3412, with one of the two outputs feeding a passive 2-way splitter for the shortest runs. Or, to say it another way, replace the first passive splitter in the above diagram with the 3412.