As a general rule, don't deviate from teks until you fully understand what you are doing. We're not trying to get rich on cling wrap stocks
You're not going to evap significant quantities of naptha at freezer temps. It's the drop in temp which makes the spice less soluble in it, causing it to "crash out" as crystals.
You DO want to evap as much naptha as possible BEFORE putting it in the freezer so you have a nice saturated solution ready to drop lots of material once it freezes down. Evap (using a fan) until you start to see specks appearing, or it turns milky.
Sounds like you're getting some condensed water vapour in there too, without the cling wrap, and that's coming out as wet crystals, possibly with much of your potential yield left behind in the unsaturated solution... You can still put it under a fan and try again, but any water will be hard to displace now.
And cannabis and spice don't usually enjoy one another's company...
“I sometimes marvel at how far I’ve come - blissful, even, in the knowledge that I am slowly becoming a well-evolved human being - only to have the illusion shattered by an episode of bad behaviour that contradicts the new and reinforces the old. At these junctures of self-reflection, I ask the question: “are all my years of hard work unraveling before my eyes, or am I just having an episode?” For the sake of personal growth and the pursuit of equanimity, I choose the latter and accept that, on this journey of evolution, I may not encounter just one bad day, but a group of many.”
― B.G. Bowers
ॐ