I can't see how this can be true. A different ISP basically puts you on a different network. I believe what you experienced was merely coincidence. Possibly your exchange.
I sat there did tracerouts on both ISPs, and saw that they had different hops, although the 3rd hop was already sky high pings. Right at 12pm it went back to normal (7ms for HomeUncapped, 3ms for Axxess) so the FUP 3 is on a different level. If it was congestion at openserve then it would a big coincidence if everyone on the exchange suddenly stopped using traffic at the same time that FUP 3 stops (or the night surfer mode kicks in). So i think on FUP3, they put you in some slow-ass bucket shaping wise regardless of ISP, unless its between 12pm and 7am. FUP3 will perma decrease the bandwidth until the rollover period, but it is the shaping that is different on FUP3 compared to the others, where it doesnt help to switch to the access count, which is weird.
