I don't think switching to a japanese server would fix your latency problems as I think all servers are in canada as far as I know. They are working on adding a fix for the latency issue for certain battles with 2.1 I think. Probably best thing would be if they added a pacific/ oceanic server like most do for australia/ nz. Im not sure which server australian players gather on or if there are many. I would wait until after the patch next week to see if that helps with your latency problems rather than spend money on a transfer and still have the same problem.