I would suggest that the source of your bagseed was a hermie plant, and therefore original hermie plant passes on its hermie genetics to every seed it drops.
I've burned plants, snapped branches, over and under fed, let a few light leaks into the grow environment, and have never had a plant produce more than a dozen seeds. I sincerely doubt the seed issue you're facing has anything to do with your growing technique. I really think it must've been a hermie seed to begin with. Super unlucky, man.
All that said, from your pics, it still looks as though there are plenty of smokeable flowers. They might be laden with seeds, which is a shame because the plant concentrates some of its energy on seed production rather than thc production, but it can still be smoked.
I would definitely let it keep growing and harvest it normally. It would be a total loss for you to harvest now. If you can, invest in feminized seeds from a reputable seed bank for your next run.