"i think the most important thing for me was to high tail it to anadyr S and keep that defended. this restricts the AI that spawns there to 5 income,"
Tried your method, since it's different than mine. 33 turns. Problems I found were: High tailing it to Anadyr S takes precious units away from getting bonuses, even though it's a small amount in the beginning. But once you get to Anadyr S, it becomes a huge undertaking. This is because: Contrary to what you experienced, the AI that starts in Anadyr S doesn't always expand into W Russia. Sometimes it goes straight to AI Canada, and the AI that starts in Shanghai goes North and South, taking W Russia, E China, India, Indonesia and Australia. This makes them a very difficult foe, and they will tie up tons of your resources, both in Anadyr S and your Anadyr N. Meanwhile, the AI that went to Canada is coming up through South America...
Still, it can work. Not my fastest time, but first try, maybe I could get luckier with the AIs next time, luck is a huge part of the Insane challenge. Not nearly as much as the Crazy challenge, but how the AIs develop in the Insane challenge is different every time. If I had a spy card, I would own them:)
One strat I'll throw out that I've had limited success with: Expand as usual, and try and take E and W US, but... Let them go. The AI that comes in through their S America will screw around forever taking your spaces, small spoiling attacks can keep them from taking bonuses. This also helps if they come in strong through your S America, you don't care as much. Just don't let them get into your Africa/Europe/Asia, and expand into them.
And expanding into them is really the key. They'll have huge armies that you can't even conceive of fighting. Don't worry about it, live in their bonuses. Divert as much as you can there while protecting what I've mentioned above. The first time you eliminate an AI on the Insane challenge will be one of the most rewarding moments you've ever had in Warlight, believe me:) Eventually, you'll be making so much you can kill anything they have.