How are you testing your 100mb connection because if you're just running tests to speedtest servers then I doubt you'll get anything close.When I had the 107mb package my speeds were great when downloading actual files. I could get 100mb+ all day long but when I went to any speedtest I rarely got over a 60mb reading from them.
I had the same thing. You will never pull 100mb on their service. I too had no splitters and perfect levels. Techs told me the speedtest sites cant handle the speed, Which is a lie. They have oversold every market and cannot deliever that speed
They will also boast and tell you on the phone that they have the fastest internet in the country. But evidently they have not heard of comcast