Fastbuds Blue Dream Matic

So at the end of the week around the 2nd to last watering for the week I noticed the buds stacked and thick on 2 of the females. Left me inclined into about a week for the other 1 to catch up to that stage and the last lady which I had broken once upon a time is somewhere in between the 2 ladies which are stacked and the last to finish. Decided to start flushing.... first time growing in coco and first time growing after 2 years or so. Thanks covid I guess. Was absolutely stunned first runoff measured at 7150 some odd ppm. That's berserk. But then again I dont ever water to run off. Took out everything from the tent today. Flushed the plants with tap water at 8.6ph at 30litres and then 10lites of 6.0ph water at the end of all of them. Smells are amazing the plants look so much better as much as they aren't to their best potential in the tent as I had to cut and remove the scrog I had used for training them. New scrog is in and holding things in place till harvest. Not much I could do. I rather have done it with hard work then having weed that's unflushed or not done correctly. Smells of sweet cherry,citrus and pine are the top notes of this tent currently. Really excited to be almost done with my first auto run ever and grow in a while. Will be watching closely and trying to harvest around a week or 2 from now. If my sugar leaves start to turn and fade quick, I'll give the chop sooner as I can't have them ugly looking buds and the trees are ready. I'm just concerned about the flush and how long is best cause I haven't grown in coco before. Lots of info out there so I'll watch my girls and decide I guess. Trying to finish the entire tent together instead of a staggered harvest....🙈 Stay blessed y'all....🙏