A couple of weeks ago I tried booking 3 YVR - YYZ tickets online without any luck fitting my schedule. Picked up the phone and called Aeroplan and they found me three one way tickets on Tango that fit my schedule for YVR - YYZ. We ended up buying one way YYZ -YVR as the points flights were not available. Just a thought to use some points and also get the timing you need.