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Regarding your extraction, thats normal when pulling with xylene, because it also pulls some plant oils that dont really crystallize. Also it may happen that some solvent is trapped underneath the oil/dmt and this makes it not dry out, so if you keep scrapping/rescrapping it will harden up more.
Another idea is to use some acetone or ethanol or IPA to redissolve it and re-evaporate, which will help getting rid of the solvent traces. I recommend doing this in any case because xylene is nasty
Good luck!