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You mention letter-spacing and then you indicate that in headers... it's the words that are spread out. Is it letter-spacing, word-spacing, or both? If it's word-spacing, that's probably the justification algorithm at work. Nothing to be done about it (although centering your headers should stop any justification attempts on the longer ones). I've never come across any of the letter-spacing situations you're suggesting using kindlegen/Kindle Previewer to convert. Perhaps a sample of the source html and a screen-shot of what you're seeing after the MOBI is built will shed some light on what's going on.
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