Hello,
I was wondering if anyone had some ideas on how to improve/maximize the itinerary below?

Background - I have broken the trip up into a few chunks to turn it into three, possibly four, vacations. I am based in YOW.

KRT-AMM-YUL-MIA-GCM-MIA-YYZ-LAX-MEL-BNE-CNS-SYD-HKG-CMB-AMM-KRT

Plans
KRT - TWOV from a TK flight
AMM - Stopover for 5 days or so mainly to see Petra
YUL - Stopover for a few weeks/months to head back to YOW
GCM - Long weekend trip to get some sun and go scuba diving (could be anywhere)
YYZ - Another stopover for a few weeks/months similar to the one in YOW
MEL - Maybe time it to go see the Australian Open
BNE - Never been there so why not
CNS - main purpose of Oz sidetrip (Great Reef scuba)
SYD - Maybe stay otherwise would prob switch to the direct flight to HKG
HKG - Transit point to CMB only
CMB - Possibly scuba diving, also a possible spot to break up the trip with the good premium fares originating from here (but it would probably be better just to get back to KRT to start another DONE or AONE possibly)
AMM - No stopover this time
KRT - Start another DONE with South America as the main target

I would like to travel starting next September so would just book the first two legs with firm dates until later dates open up. I will have about 4 weeks vacation from work to spread the trip over.

This prices with about $1100 in taxes but I am guessing that I can't trim that too much since I am already avoiding BA where I can.

Other than visiting a lot of great places, this trip would also be an introduction to OneWorld after becoming disillusioned with AC. It would be a good starting point to getting status over in this neck of the woods.

Thanks for any advice.