trying to crystallize thca from ethanol extract is an adventure. i would not recommend it to anyone who does not have access to their own analytical testing.
best piece of advice if you can’t get it to crystallize is submit a sample of your extract for potency testing. Evaluate the THCA:THC ratio. your extract should be at least 70% THCA and > 10:1 THCA:THC, otherwise crystallization is going to be even harder. good luck