pretty sure you’ve only got one theoretical plate in your rotovap. If you’re using a hydrometer/proofing gauge & your liquor is coming back at 190 or better, then clearly it can be done. That doesn’t make it the right tool, and you are removing water until you hit the azeotrope. not avoiding it as you originally posted.
perhaps we could get back to OP’s pre/post processing to get higher numbers?
@sunny 80% THCA is easy via cyroethanol. Now that I’ve gone back and done the math, 80% THC without post processing isn’t all that difficult either.
although calling it crude at that point seems disingenuous.
My best EHO to date (no scrub) was 92% THCA which exceeds your 80% THC threshold by a whisker.
if that doesn’t make sense. read up on why 100% THCA is less than 88%THC