I am in the same boat. My AOR is 7th July and I'm still waiting. I also have visited more than 6 other countries including US.
I think that it depends on your travel history. The more countries you have visited, the more time it takes for them to process your case. I am suspecting this because my friends who applied after 2 months than me and have a really short travel history got their PPR last week.
Anyone else here thinks that processing times depends on travel history? It's just my theory so don't attack me