I would keep adding grow nutes until they quit with stretch, then add flower nutes. about 10 days or so when the flowers form, I'd hit em with some sort of PK boost to start the weight gain. Dont forget to start Molasses with your feeds as well. The autopounders will get FAT with that regime!! I love that autopounder strain.Good smoke too. I grew em 3 times and love the structure. Also Budaha seeds MAGNUM are a great one to boot. I would love to see both of those grown with someone that can kill it in deep water culture. They would be monsters!!! On the leaf tip problem, I would suggest to go through and check all your variables as for temps, light height, even ph(let your nute solution sit for 20 minutes or so BEFORE you water. I usually only run one strain per grow so as to not have to deal with any more problems than I have to. Youtube(Dr. Autoflower in search bar for "things you should know about autoflowers" pt1 and 2 is a great watch!!) Also using RO water, Cal/mag MUST be used.(im sure you knew that.) A bit more on your set and temps would help some with a diagnosis. As far as the pics, might check your settings on your camera.