To answer the original question, it's probably worth straightening. But you need to do an analysis to make sure you've correctly identified the error(s) and the shortest route to a straight frame.
Draw yourself a sketch with the measured deflections and see if they're consistent, or seem contradictory. Once you have a clear picture of what needs to be done, then it's fairly easy to go about resolving it. But you don't want to be working this back and forth trial and error. Steel is forgiving of cold working, but even steel has finite patience.
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