Interestingly your connection still had a wobble around the same time as our connection issues (increased ping times) but you seemed to ride it without losing your connection or the increase latency afterwards.
They offered to shift me because of ongoing single thread speed issues. I elected to go on TTw when I joined and they were supposed to have then moved me onto BTw, but their provisioning department had moved me onto Zen. I only found this out when I had further single thread speed issues and they offered to move me to BTw.
I have found that they will talk about taking things up with their suppliers, but if you push them about which supplier they are using for your connection they will tell you.