As a P25k I learned quickly to managed my expectations. I struck-out repeatedly attempting to e-upgrade between YVR and YYZ. It was comical how far down the list I was. I did however successfully e-upgrade between YVR and YYC 4 out of 4 times.
Another piece of advice, if you didn't already know, is never buy an Economy Basic fare. They are not eligible for e-upgrades, nor are they eligible to upfare if you realize afterwards.