So I just let NNTP run wild and learned 2 things:
1) The backhaul upgrades Octotel did last night definitely seem significant. I just hit 80MB/sec on a download and I wasn't even cranking the connections to max.
2) I'm still getting black-holed and having to spend ~5 mins without international access when fully utilising my line.
@websquadza - I'd really like to know if / when this will be resolved. It has been many, many months now since first encountering the issue, downgrading because of it, upgrading again and still being limited. If a resolution is not on the cards, I'd also like to know so I can reluctantly start looking elsewhere.