Hey @joedbanks, @Akoyeh and @elchemy are both correct.
While it is conceivable that there is continuing biosynthesis during dry down, and it’s even conceivable that this continued biosynthesis favors CBGA=>THCA over CBDA, it seems unlikely (imo) that any biosynthesis is occurring during “cure” (post dry down).
nor is it likely that there is any isomeriztion going on in-situ during “cure”.
Unless it’s this years crop from the west coast, in which case it may have been sprayed with catalyst in the name of putting out fires, and then all bets are off (still not “biosynthesis”).
Edit: When you harvest (how ripe your plants are) can certainly affect the CBDA/THCA ratio and/or the absolute value (as well as total yield!) on a dry weight basis (that’s why I don’t recommend you do this without In House analytics ).
And you can turn THCA into THC during “cure” if you do it really wrong, but there are only a handful of states where THC counts against your hemp and THCA does not.