Gelato Auto Fastbuds

We couldn't come up with an answer on why the leaves were like that, In the meantime of getting the consensus as to what the issue is, I start to notice the tops, more particularly the new growth being twisted with burnt tips. Having not added any fertilizers at this point besides what's in ffof i knew it was not nute burn. I referenced a 'diagnose your plant' diagram and suspected I had the start of potassium deficiency. Luckily I had some Happy frog dry amendment to add. I ended up adding a quarter of what was recommended because doing some research on nutes and what kind i wanted to try a lot of the helpful info was adding less than they say.