Couple of questions about poor performance - Time Warner Internet

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This question is about "Couple of questions about poor performance", with Time Warner Cable internet and apps. I'm in NW Ohio the Dayton area and have the TG1672G modem/router with the 50mbps package. I've had it for 3 months now and average 5-12mbps. After some reading I change some settings in the modem and got 49.88mbps. I moved the modem to another room and it went back to normal. Moved it back and still normal or below. There's a few different splitters here, a -3.5db and a -5.5db. Which do I use with the modem? And there's a power inserter in the other room where I'd like to keep the modem, without the A/C converter plugged in there's 0 connectivity. Should I have the modem wired from the inserter?

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