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Your lowest noise margins of the low power stations are in the mid 20s. Your full power stations are all 40 dB or more.
75' of RG6 = ~5 dB insertion loss.
4-port splitter =~8 dB insertion loss.
You've used about half of the available NM for the LD stations and that's before adding the real gain of your receiving antenna. A distribution amp won't harm anything, but it probably just isn't called for.
This assumes an antenna with real gain mounted in a location with an unobstructed view.
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