I’ve been thinking about this….
Now I don’t know nothing about nothing, but some observations.
Rosin isn’t decarbed unless you took that extra step.
I’m assuming that winterization matters because of the lipid content…which may or may not throw off the reading (just spitballing there).
I also would assume you would dissolve some rosin into alcohol to test, perhaps. Not positive on that… but it’s my guess. Hell it’s all a guess, just throwing ideas at you my friend..