When it comes to temps, the best piece of advice I ever received is to watch the chicks. Their body language will tell you whether the temp is right or not. If they're huddling together, piling on each other, it's too cold. If they're trying to get away from the heat lamp, it's too hot.
You might try a bit of yogurt, too, that can act as a pick-me-up especially for chicks that have just gone through the stress of shipping. If they don't eat the yogurt by itself sprinkle a little feed on top of it and before you know it they'll be pigging out.
Good luck with your survivors! Sorry for your loss.