Look at the upstream as well (between 35 and 51), downstream is ideally between 10 and -10. What was the second box that you tried? Do you need all those cable connections?
You’ll probably need a different amp. Something like the attached, instead of amping the signal, it replaces the loss of signal from splitters. When you combine your 15 dB gain amp with the 18 dB loss on splitters (11 and 7.5) and an 18db gain on your upstream you lose a lot. Your internet shouldn’t even be going through the amp.
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