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looks like a pH disorder, altho the pic isnt so great it does help diagnose. hope u can pin it down. personally i give 500 ppm or so the 2nd to last week with extra sugars like molasses then top water with clear pHd water heavily
Every strain/pheno is going to hold nutes a bit differently.
Every grower uses a bit different nutes/temp/RH/light/strain/pheno than another grower with the “Same” setup... so every plant has different amounts of nutes in it.
In my experience, a moderate feed (lucas) throughout flower and then a period of 2-3 weeks of plain water is usually optimum. By the end of flower there are few to no fan leaves and the buds are anything but bright green anymore.
Heavy feeding indicas are NOT what I usually run and I've only had one strain go crispy like you say... it was Pandora's Box by SubCool (don't like their genetics at all... bleah) and it was a heavy feeder.
My advice? With a heavy feeding plant you may want to decrease your plain water feed time. If the plant is going through nutes that fast it won't take it long to use up what storage is there.
Now.... if you've overfed your plants for a bit they can store up an amazing amount of nutes and can be fresh and green with 2 weeks or more of plain water. Fun stuff!