The healthy plants look great, congrats! The discolored leaves and then the browning looks like nute burn, since you weren't feeding them much before and then loaded them with all those nutes it looks like you shocked them. This year is my best year growing and I decided to use FF Big Bloom and Grow big while vegging and used a little Tiger Bloom when flowering but I guess I used too much on one plant and she immediately started willting and was dead in 5 days even tho I was flushing every day, I think I gave her root rot.. On the Indicas that I used Overdrive on the colas have totally bulked up maybe double in size.

I was going to post to you before about the brown shit on the leaves because that's exactly what it is.... when I see that on my lime tree it is shit from the aphids the ants have put on there. But you discovered the thrips so I guess that is what you have. In growing my plants totally outdoors I have never ever had an insect problem. If I did I would use diatomaceous earth all around the soil and dust the leaves, that seems to kill any and all insects .... will even keep fleas out of your carpet and off of your pets. It's cheap and non toxic, just don't inhale it.