unfortunately, you have a few strikes against you, coming from AU. It's about +200 just getting across the pond to the NA shores, then when you finally get into Canada, things get even more screwy in route again.

Find the IP of your server with resmon, run a trace when you are lagging really bad so you have a good example, and forward that to your ISP if you can, as well as SE. Hopefully if we can get enough people attacking at least this part of the problem from both endpoints we can get some improvement on that front.