Is this nutrient burn?

Short and sweet - Since you are just adding nutes, now, i'd lean deficiency and some concern about your absorbic acid use if you didn't re-balance before adding to medium. --------why and any details----------- First picture looks like P-deficiency.. .some blue around veins and a dark blotchy spot. maybe a mg-deficiency in pic 3 .. but if the interveinal chlorosis doesn't consistently coincide with the spots, the spots are calcium and the interveinal chlorosis is one of many potential things. You don't have to take anyone's word on this.. plenty of visual aids you can google image search "marijuana leaf symptom chart". www.youtube.com/watch -- is another good way to familiarize yourself with nutrient-related symptoms. Lockout and ph-issues is usually when things look messy and don'tn fully translate from the above references... occur in wrong location or just a whole bunch of coinciding things at once. The last couple pictures are droopy .. could be too much light - see 2-3 sets of fan leaves very close at top..easy to rule out.. if you haven't changed the lights in recent 1-2 weeks, probably somethign else as that tightness would be seen below, too. when you used the absorbic acid, did you ph-blance it before use? Do you knwo what pH it was when you added it? I strongly suggest not worrying about chloramine or chlorine in your water. It's at such small doses that it is irreleevant.. In fact, the plant needs a very small amount of Cl, anyway. 1/1000th compared to NPK concentrations, but still uses it. Anyway, pH being off balance by more than a little can have major impacts.. if 5.8-7.5 probably won't see a problem (that's a wider range than you should target.. ~6 for soilles and ~6.5 for soil context) Usually if it is WAY off, you get a smorgasborg of symptoms. Also the first thing that has an issue is typically Ca as pH drops, which doesn't look to be the first syptmom shown. This looks more specific, but life is messy. Symptoms are not discrete. You need to take all the possibilities and rule them out in rational ways until something is more obvious than the others. You have a lot more information at your fingertips that you can't include in 280 characters.

There is a few things to check in this question! Your plant is telling you a lot! Let's put it like this: Dark green color + clawing tips: Too much N, probably. Seems like you are moving onto bloom! Slowly cut the Nitrogen supplement and start replacing it with phosphorus and potassium! Brown spots on the leaves: If my guess is correct I would say thats Magnesium deficiency, try adding a bit of CalMag! (little by little, as for all these nutritional changes! Don't go over board in a single water) And this might be a stretch but... light/heat stress? I notice some of your leaves are curling upwards like crazy! You might want to check the temps and or light distance! Hope this helps! If anything, you can dm me :)