check the FAQ's friend. Read up on the specific tek you were using, about the problem you were having.
I'm having a hard time understanding everything about what you're saying without all the details.
But 50g of root bark is not an overly large amount, 448g yields about 3g of dmt. So with one ninth of that you should be expecting maybe like .2g-.3g or so. So there wouldn't be a lot of crystals.
Naptha doesn't dissolve the crystals? The crystals form in the naptha. I have no idea what other steps you'd been taking before this. Jars are used in numerous different ways throughout the steps of various teks...
There should be naptha left after the freeze precip, the crystals should have formed in it. Freeze precip can take some serious time, and depending on the amount of naptha you originally used for your pull, you may need to evap it a little bit before the freeze. After freeze you should see some crystals in your jar, and then after pouring the naptha through a coffee filter to decant. Then dry the jar out in front of a fan before scraping. You may in the future want to use a pyrex dish instead of a jar, as its easier to scrape.