That's what I thought about the splitter. I was thinking my upstream was in mid 40's before Mediacom tech was out and changed everything from the pole to modem out. I can't remember when it went to 50. I wonder if my splitter did it? I know the tech put a newer filter and I have no splitters other than at the modem anymore. At least there are none in the box now.
Mediacom tech gave me a new splitter and it didn't change anything. Since everything is new from pole to my modem I'll assume this is as good as it gets or at least whatever is putting it at 50 isn't in my home.