Your ISP is routing you to some wonky places by the looks of it. Though I am not all that knowledgable in this area.
It's not SE's doing here. It's your ISP.
It's almost like saying "I don't want to upgrade my potato computer to play a modern game. I want the latest games to run on my 233mHz Pentium 2."
If you were getting 150ms while living on the east coast, then that should be proof enough, as you should have been sub-100 to begin with.
The only way around this is a VPN. $4 per month for pingzapper. Best investment you can make if you really care about your gaming.
$4 is less than a pack of cigarettes or a beer. Per month. Just trying to put that into perspective.
No offence intended here but I don't buy this whole "I don't want to pay for another service on top of my sub to play a game". If you care enough about playing then the added cost of $4 per month shouldn't be an issue. I have been doing this since pre-2.0 and I never thought twice about it after I started using it.