Leaves burn 3

the balance of what you are feeding is off. See too much of something and possible too little of others... but when dealing with too much of anything it can easily be lockout. pH of 6.5-6.8 is better in soil, but N-uptake isn't the problem here. They look a bit glossy in spots. Also, senescence is usually unavoidable near end even when none of these issues exist due to our efforts (in this case fertilizers). So, all 13 FF nutrients probably aren't necessary. Less is more, generally. If there's a multi-part system, check labels and add up PPM of what it provides. if it doesn't have guaranteed analysis labesl, well ffs, .. if it doesn't, lol, start at 1/2 str, look it over and see if it is missing any of the primary / secondary or trace elemetns a plant needs. may need a supplement like cal-mag... do not assume you need cal-mag, it isn't magic. So, slim down your feed, balance it off if you can... i think it can handle a good water-only irrigation with some runoff. If you have 50% perlite or some other similar drainage amendment, go ahead and give a 1/2 dose of your 'new' balanced feed. (if it was already 1/2, 1/4th label instructions if there are no guaranteed analysis lables with which to calculate PPM of each element provided) after that do your regular cycle of water-fert.. wait for top 1" to dry.. weight of pot should be familiar.. rinse and repeat for each cycle. every other? every third fertilize? i'd pick one and adjust. depends alot on pot size, amount of light provided etc as far as what is best. it may be too late to see any drastic changs... but this is starting conservatively and can move up to the new feed full strength the next fertilization... always read plant if it nosedives and correct course. Always consider your recent behaviour and the fact that a few pictures and a few bits of information are not always enough to be precise. don't do anything you aren't confident doing.