Leafs getting pale, spotted and dying in late flowering.

Might be worth getting a closer look at your trichomes as harvest time wont be far away. I am using the RQS pellets (love them) and have 1 plant left fading hard now at week 10/11, just very close to harvest. Did you use any bloom boosters? Plants pull a lot of nutrients in flower and without bloom boosters or pumping extra pk they might have been eating themselves quicker than you'd hope - probably not much to worry about at this point though!