if it's the plant, and not environmental, then you will achieve nothing by changing the dark period. it will just be droopy and asleep at a different point of the day instead, still in the light period.
you are literally sat there trying to make nothing, into a new problem. if this is your first grow, then you finnish it, that's all a first grow is EVER about, just getting to harvest, doesn't matter if it yields you 2 grams, the idea is learning.
and what experienced growers? lol, how about all the ones in this thread pulling in lovely big harvests not trying to invent the reason for a plant problem.
you don't know what you're talking about, what you're doing, you have a shit attitude, no wonder i am following in the steps the rest of people refusing to bother helping you.