Even in cases where I would have approved of a longer sentence (a #BlackThugsMatter arsonist instead of a rancher doing a controlled burn), I would not approve of this sort of governmental exercise of power. Once a federal judge sentences a "criminal" and the convicted "criminal" serves his sentence, it's time to let it go.
“Technically, re-sentencing is not (quite) double jeopardy.”
Only if the judges correct their sentencing errors quickly an immediately, before the sentence is served.