SMH Harvest when ripe. You can’t change the genetics. I just don’t understand where that came from. That you can harvest early to change effects. No no no.
You can harvest late and create a heavier loaded buzz. But you can’t create a hybrid buzz with an indica or a sativa. Plus hybrids vary like a mother fucker. Your either leaning indica or sativa. My opinion. Find what you like in weed. Search various seed banks for those genetics and pheno hunt. Harvest when the plants ready If not. It’s up to you