like others said, u backed off nutes too soon. It takes 2 or 3 runs before u can dial in a strian, so learn from this and feed a aweek longer..
It looks damn near done, like 10days off.. which would me u stopped feeding at exactly the right time.. Good flushed ganja and good organics will look like shit, come harvest time. You're plants should not be full dark green leaves come choppy time. but judging by pistil color over the internet, or even if your right in-front of it, can be misleading.. tons of things could of caused pistils to wither. same with trichs going amber.
watch the calyx size. See the fat single calyxes at the branch unions? Those are the oldest and most mature. when your bud calyxes reach the size of those single calyxes, its mature.
yes, some seed dealers nowadays, typically ones with chemdawg heavy lines, will advertise shorter flowering times. So u got to watch out for that and account for that. Err on the side of caution and slate at least 70 days for one of them..
after 1 or 2 more runs, you will have dialed what is the right time to havrest to get bud that u enjoy the most. Flower time is, relative and subjective, for the most part..