For all oil bearing herbs the oil amount peeks after the dark period.
So the idea is that if we extend the dark period we’ll get the amount to peek higher.

I’ve read it so many places and in quite a few books that I believe it
well then, all is good! heres something to try... cut the tips of every leaf on the plant, (other than resinous trim leaves) put it into darkness overnight, and compare the amount of resin to what it was before... you will be surprised i did it yesturday, and today she looks frosty - good luck...