Lockout Issue, not specifically sure of problem!

True nutrient "lock out" does not occur until the pH is below 5.5 or over 7.5, which clearly your system isn't. Some clear and close up pictures of the affected parts would make answering this question much easier, at this stage all I can see is burning from previous overfeeding, and not much else. You may be quite happy with what you are seeing, but you have to remember, the people you are seeking advice from are trying to determine what they can see on a computer screen 100s or 1000s of miles away. The brown spots could be a cal/mag issue, a virus, insect damage etc but without clear and close up pictures taken under normal white light, giving an educated opinion is impossible. Close up means 2-4 inches away and focussing on a good example of the issue, not a random picture from 2 feet away. Don't worry, this is quite common in this forum, so you are not alone, but it surely is the most frustrating part of answering questions on Grow Diaries. If you want a more specific answer, re-post this question with some decent pictures and then the collective wisdom of the group can offer you some insightful opinions on what it is and what to do about it. There is no way of dressing this answer up to prevent any potential sensitive people from getting offended on someone else's behalf and making everything sweet and wonderful, without direct criticism, we as a society will never learn. It is called the real World, not Disneyland. Cheers, Organoman.

There is more of a potassium deficiency then nute burn on plant. 1 leaf shows burn. Others potassium deficiency. The brow curling up and in is old nute burn sign

You got some serious nute burn going on, you probably over fed, flush it and add a normal feeding back in, don't go so strong this time. Check your pH at the beginning and end of the process to make sure it was and is in check. That's where I would start for sure.