Don't worry about DLI in this stage of the grow. I've looked at your pics and it looks like a cal and mag issue. The color indicates a cal deficiency and the pattern is mag. With possible phosphorus deficiency. If it was my plant I would be hitting it with a good dose of
calmag and some fish meal and worm castings. You can't fix the damage that has been done. It looks like the buds just flat fed on your sugar leaves because they weren't getting what they needed so there striping it from where they can get what they need. And it will go right down the plant. I don't know that I would flush it to hard. Something about this super fad of flushing,,, it's like people are just flushing endlessly now days. I can count the number of true lock outs I've had on one hand in all my years of growing that truly needed a flushing. And the number of times I caught myself over fertilizing stoned out of my gord when I shouldn't have been gardening and had to do a emergency flush on the other hand to keep from burning the plants down. Good Luck!