improve retrying on error

[BlinkyStitt]

we still let too many 500s slip through. investigate more places we can do automated retrying

[BlinkyStitt]

There was a ? on one of the request handlers so that we weren't actually retrying if an error happened on that line. I made an error there continue the loop to try another server.

And I also added another layer of retrying on errors. I might end up removing that one if it just makes error responses slower, but we'll see how it works in practice