Hey,
We have a very very similar timeline and also transferred to Sydney, Aus. We're in the same boat as you with lots of action at the beginning with AOR1, SA, File Transfer, AOR2, Medical, all happening within about 6 weeks. It's been radio silence for the last 6 weeks since then, though. I think that's probably pretty normal. They gave us a lot of communication at the beginning to get the information they needed, and now our files are likely in a cue for processing. I'm hopeful that June will be our time! Looking back across the last year on the spreadsheet that this forum keeps, the (very few) Australian applications seem to get processed in the 6-8 month range...