Progressive yellowing on older fan leaves ~F14-F35

Your plant is beautiful, It is really getting close. Feeding at 72ml per gal at this point is heavy. What your leaves are showing is more like overfeeding signs or most probably because your pH is off in the root zone (because of salt build up). In late flowering you should be aiming to finish with under 400ppm in you medium at harvest. Do you water untill you get runoff? Take the time to collect some and check pH and ppm. I see you are using Remo nutes, do you watch urbanremo on youtube? For his 8 footers monsters Remo crank is ppm up to 1800 on the 700 scale and last 2 weeks feed with water only.