said by floydb1982:I had a unused unopened 3-way Aneronix CMC2003H splitter that had been on the shelf in my back closet I came across while digging around my closet. I replaced the 2-way Regal DS2DGH10 with this 3-way and if I am reading this correctly my signal levels are looking a whole lot better than they were before.
Yes, all your signal levels look good now.
From the new readings, I'll assume that you (properly) placed the modem on the one "-3.5dB" port of that splitter.
The Regal is a good quality splitter, like the Antronix, so either that Regal had (or developed) a bad low end (below 30 Hz) response, or sometimes even just breaking/remaking long-time connections can fix low frequency issues, but in any case, it worked.