What could be a reason for crystals not appearing after re-x?

Initially swim didn't make any re-x, just evap and got crystals on the bed of oil. They were nice, but amount was little. Now he does re-x and gets white powder. Problem is that he also doesn't get breakthroughs with this powder.

How much bark did you start with? Also, temperature will change re-x results as far as size of xtals. Since its summer, they take longer to form. I keep my home 77-78 degrees. My re-x takes days to show signs, but the xtals are a 1/4 long. Too cold, and they just drop out leaving dust, and get mixed with other compounds. The yellow Goo has a higher melting point, so I like to start warm so the dmt stays in the heptane while the Goo falls, then the xtals grow on top.