This is interesting and points to water being a possible issue originally I think. Does it feel xtaline after decanting/drying? I wonder what would happened if you dissolves this dessicated product in minimal hot water (~2ml) and then combined that with EA (~100ml or so).

Sorry which super fine powder?

I think it makes sense to split your next pull. If straight forward salting doesn't work, drying with sodium carbonate before salting the next split makes sense. This is a very standard lab practice, we just skip it because we found it not necessary - except that we have this goo issue some folks encounter.

I recently did just this, spit a pull and dried one side with sodium carb. No issues on either side, Xatals in both. The sodium carb side would be more robust to excess water issues though, if that is a thing.