I haven’t seen this chart. I’ll post a picture of the chart I found on the coco website that talked about how they use nutrients. Could this be nutrient burn? I read that if a plant experiences nutrient burn that the plant may be more sensitive to high concentrations and to go slow.
Is that chart from GH? You're mixing those amounts per gallon, not per liter (right?). Which week are you doing?
Looking at "late veg," that's not very strong. The NPK ratio is 2.14-1-2.61 . (I'm not counting the
floralicious and other things. Just the 3 bottles.). That's high K by my standards. But, some people do that. (Some of GH's schedules have K going to 3 parts. You saw that in the chart I posted above.). I think that can cause thick, leathery leaves. But, so can overfeeding. Overfeeding a high proportion of K might do it more.
The calculated PPM is 179. (That counts elemental P&K. It's actually supplied as p2o5 & k2o. That comes out to 205ppm. In reality, it tends to be somewhere in between. Either way, that's pretty low. I thought soilless growing tended to feed stronger.
However. The schedule says "high frequency." If it expects you to feed every day, that could be like feeding 600ppm every 3 days. So, maybe that's the way it's strong.
To me, the leaves don't look like you're underfeeding. I wouldn't feed more.
When you feed, do you get runoff? That would help prevent salt buildup in the medium. I assume that's not wanted in coco.
If you want to work out the exact NPK ratios you're feeding, I can give you the spreadsheet I use. It's kind of handy to see what results from mixing bottles different ways. If you ever contemplated a different "lineup," you could compare what you're feeding more objectively (what the plant's seeing, not how much from each bottle.).