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- fine-ass '22 harvest!

Also, you are growing in straight coco + perlite, right? If you're not running it like coco should be, troubles are just starting, coco can't be treated like true soil, it won't work well at all,... coco is a soilless medium, with a lot of do's and don'ts that other soilless don't have to worry about.. Coco has an odd cation exchange capacity (CEC), which makes it a real Ca hog, Mg to a lesser extent,... in many ways, it's treated more like hydro than soil.. typically you run-15-20+% run-off each feeding, to prevent nute salt build-up and off pH,... coco breathes really well, so it's harder to water-log it, another reason you can cycle nutes in and out faster..... So, it may be that you have this problem now, build-up that's making her bitchy about feeds,...
You need to do a flush, which is also done differently that with any other medium, or risk screwing up that CEC balance in there further,... good that you were using Ca-Mg though!
Always, you need to monitor your input pH and TDS/EC going in, and going out as run-off,... it's a pain, but that's coco hand-watering for you-

Do you have a TDS/EC meter? Get one, it's all guess work otherwise, and that with coco doesn't end well usually,...
flush solution recommendation is RO/Di water, with 150ppm Ca-Mg, plus another 150ppm of nutes, pH to 6.0, and poured through until runoff is at or near input values,.... then let her dry a bit, and start reg. feeds again,....