well, everything sounds good and you're using top quality soil and all that so i can't come up with anything other than light burn, over-ferted or rootbound. but your tops look very healthy and from what i can see in the pics the only damage is on the lower branches and leaf tips...eh? this close to harvest i'd just keep doing what you're doing. those leaves i see crisping up in various places are normal and you'll be seeing a lot more as it ripens. some strains i've had are pretty much cleaned by themselves by the time harvest happens while others are a mess crammed with trimming material. maybe next time transplant to a bigger pot once sex is known but other than that and watching your light distance i can't add a thing...it looks like you're almost there!

i stop all ferts/additves a month before planned harvest because the nute's build up in the soil with regular use (i feed em appx every 10 days) and i want to be sure it's cleared out before drying. i usually give em an extra dose of N using the veg ferts for the last feeding along with the flowering ferts during flowering to give the growth a boost but beyond that it's water only and even the water gets cut back as they mature for the last 4 +/- weeks. but that's my way of doing things and as you probably know by now there are many ways of getting there and you just need to find and use what works best for your situation...iow, nothing said here is written in stone as THE way of making flowers.