Do you also suppose the Wind network is overloaded in the GTA? I'm in Guelph, and we have Wind here with a huge emphasis on university students. Looking at the cellular tower map, there are a lot within a 5 km radius of U of G. Never tried it, so I can't comment on the speeds, but there's a lot less people in Guelph than there is in your area.
Good imformative post, btw
I'm not so familiar with the tech side of cell towers. When there is no signal at all in areas close to the GTA where there previously was signal, I don't know what the explanation for that is. It's possible that Guelph might have better coverage, but I'd ask some fellow students for feedback. So far, I haven't had any spotiness with PM, but it's only been a few days and I haven't been driving around much. Time will tell, I suppose!
Good luck at school!