Congrats on your grow, you have grown a monster! As for your question, on my last grow and this time around, I have added blackstrap molasses to the water while flushing. My last grow, I had some clones that I sent straight to flower and grew in coco coir, so at the end when I was flushing the plants I added 1 tsp/gal of molasses to experiment with what it would do. I had read about it online and seen arguments for and against it but I had to find out for myself. The results, all four of the clones had enormously bulky buds and had a sweeter taste overall after curing. I highly recommend it!
Check out the following articles, they provide a great explanation. You can also look up Harley Smith, he is extremely knowledgable individual when it comes to cannabis. Good luck on your harvest!
https://www.growweedeasy.com/7-tips-to-growing-top-shelf-buds
https://www.growweedeasy.com/flushing
https://www.growweedeasy.com/how-to-grow-sweet-smelling-buds