Very similar situation over here too. Little behind you on flowering but I seem to have more fading and dying fan leaves.
I backed off nutes 2 weeks ago and didn't seem to help, my plants are well root bound so yours should be as well. A good soak is what I have been doing. I experimented on my Herm'd plant and took it out the pot and realized the roots were so dense or I wasn't watering right but the bottom quarter of the pot wasn't as evenly saturated because I think the roots acted like an umbrella. Anyways my swag.( Scientific wild @ss guess)
I was only feeding mine wedding cake clones only 1/4 to half strength of 0-10-10 that have some big buds right now. ( Pre-flower to 4 weeks) and I think my buds are asking for more as some have suggested.
I think your plants as well need some P&K.
And make sure all of those roots get their share of water.
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Earlier in the week∆∆∆
View attachment 5040471today after damaged fan leaf removal