I totally get the patients issue

. It's yellowing because of an issue not because it's done growing and maturing. If plants have enough food and the right conditions they will stay perfectly green until they are matured beyond the point of being able to reproduce. Then they will die. I dont mind if my plants get a little leaf fade the last week or so, but when it happens they have already stopped making new growth and are using every last bit they have to swell up and try to ripen.
Your plants are using everything they have to survive. I think as high as your ppm are the plant is probably locked out and is feeding off it self to try to make it to the end.
You honestly might get away with just giving it ph'd water till the end. It have tons of nutes in the medium right now.
The trichomes say a lot about ripeness but really are the last thing to look at after the plant has given you other signs.