So you maxed at 65 Mbps in multithread here. You should also try manually selecting 200MB from the download test -- you'll probably be a higher result.
And then you maxed out at about 13 Mbps using the classic single thread test.
Yeah, your latency graphs actually look really good. For a comparison here's what it looks like on a poor quality satellite connection.
https://testmy.net/latency?q=52705179518882&n=100
How is your computer connected to your connection? Does the connection come into the DSL modem, to a router and then wired to your computer... or is it wifi to your computer... or is your modem directly connected to the computer with a cat-5 cable?