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You might have a slight bit of nute burn but you can't be that far away from flushing them

Hey Harold Looking good. The only thing I would suggest next time is to trim out more of those fan leaves. I suggest lollipop them (strip out everything below the waist) just before going into flower and then trim out the fan leaves about 3 weeks in. You'll be amazed at the difference it makes to your yield Other than that, a good grow 👍

Nutritional needs do not drop off at week 4-5 apart from Nitrogen.The need for P and K will increase at week 5 which is why most bud boosters are to be given from wks 4-6.I guess they'll be crying out for more P Phosphorus and K Potassium now.It depends how long its got left to flower.It looks like its got around 3wks to me.They put the most weight on 3wks before harvest.This is when they'll need the extra P and K.I guess they'll be on that wk3 now.Have you seen a sudden increase in size this week?They'll be taking the nutrition out of the leaves so you'll see your leaves loose their colour.

overwatering shouldn't be thing unless you are not allowing enough dryback between. You should always fully saturate. that is never overwatering. If it's soilless, should get 10% runoff or more anyway. You guve the volume to accomplish the task, not some predetermined volume.. you only learn it retroactively and only if you trigger an irrigation at same loss of weight from the pot / same dryback. Will never overwater following these simple practices. Anything negative occurs, it's the fault of how the medium is constituted and nothing else. Add more perlite or simialr, if so. More than one thing can cause tip burn. Maybe too much P. Some plant slook a bit on the lush side. Think the other symptoms coinciding could be P inhibiting other elements of nutrition. Also, have to make sure it's not coninuing to get darker. (excludes temp related purples). I see some glossiness and clawing. If it keeps getting a darker green, definitely back off on at least N if not a dilution across board of any fertilization occurring. Once leaf growth and stem elongation ceases ~4-5 weeks into flower, nutritional needs drop quite a bit, plus you should have leaves well-stocked at that stage, too. Once i see that lushness creep in, i dial back to a well-balanced 500-600ppm diet, but that's soilless/hydro context that won't directly apply to soil. same dynamics occuring underneath, though. Don't want that canopy degrading too much before it can ripen.