Still with my speed test as well as yours, even though it's business class, the speed came out pretty good compaired to others. I only have one step above the basic service in internet speed here in my home office that I run my business out of.
I think in my case however, that being 3 blocks from the Comcast RT and the fact that Comcast, the year before last, changed out all the aerial terminals here to new digital types helps alot for my speed.
Genreally in my experience coaxial cable tends to smoke twist pair technology every time when it comes to speed and quality of digital signal. Only hook up I know faster is fiber to the prem., like Verizon (used to be GTE), Frontier (used to be Citizens Utilities), and Surewest ( used to be Roseville Telephone) does out here in Cali.