I think you let up on the feeding too early, that plant has a ways to go. If it's at 6.5 weeks right now, I'd say it would need 10 or more to be mature.
I'm not gonna say flushing is bad or good, but it's definitely not required in order to get a plant to mature and ripen. Since you're still a newbie, it's honestly probably better to grow a few plants where you feed all the way to harvest, so you can see all the signs of ripeness happening on a healthy plant. Otherwise you're pretty much guessing when to start flushing, and can end up in this situation, where the plant is totally drained of nutrients but only about 2/3 or 3/4 done maturing. Once you get a few plants to finish without flushing, then you can consider incorporating that into your process to get slight improvements in quality (subjective, of course).
I'll also say, trichomes are not the best way for new growers to determine ripeness. There are other signs of ripeness that are clearly visible without a magnifier or other special equipment - pistils all turning brown and receding, and calyxes swelling to where the buds almost look like popped popcorn. If those other signs aren't there, the plant is not ripe, no matter what the trichomes look like.
Good luck!
Edit to add: nothing wrong with amber trichomes. Lots of folks think amber = couch lock, but they are wrong. Plenty of folks think harvesting earlier will give a more "sativa" type effect, they are also wrong. Let the plant mature and ripen fully for the most beneficial effects for body, mind, and spirit.