Dial back fertilizer concentration - They look very lush (dark). A little fade is safer than getting darker over time. Make sure it doesn't fade too fast, of course. I prefer not to see any fade until the last couple weeks. Some leaf symptoms are a result of senescence too, so the rate of progression is the key to focus on when it gets difficult to discern cause.
A fade is not necessary, just make sure it's not trending darker over time. Keep it healthy and as blemish free as you can, otherwise.
Still need building blocks (nutrition) for ripening, but without stem elongation and leaf growth, it needs a lot less than before.
in a soilless/hydro context, probably only need ~500-600ppm to maintain health and avoid fast-trending deficiencies. Calculated from gauranteed analysis labels and not a TDS reading converting EC.. converting ec to ppm is not accurate... Just the brand of the device you use results in a 30-40% difference in value displayed because they whimsically use different conversion factors (500 scale vs 700 scale vs 650 scale etc). This doesn't mean much for a soil context, but roughly translates.. you can find a level of fertilization that more closely meets needs and if anything causes a slow degredation in leaves rather than continueing to buld up to toxic levels late in flower. trial and error... if it fades too fast, bump back up... if it continues to get darker, go a bit lower with concentration etc... easy peasy.