hey, nice pics. You said about the purple branches coming of the stems, do you mean the fan leaf stems?? because I have this too but I just put it down to genetics. I have seen plenty plants with purplish stems and they seem to be fine so i tend not to worry about it. Also my fan leaves seem to curl a little bit but this could possibly be because the NL fan leaves are huge and have a little weight(but thats just my theory and I guess im a noob lol) it could also be because of overwatering or even underwatering. You seem to be adding alot of nutes, salts, vinegars, and lots of others things to your plants but I think u seem to be overcomplicating your grow man(i mean no offence here but im just trying to help). the only thing I ever put in my plant pot is water that i leave open for 24hours and they seem to be growing fine... I mean sure... I have some yellow leaves on the bottom of the plant but who cares lol. I only plan on adding nutes when the plants are big enough and plain water isnt doing it for them anymore, I just like to let nature take its course. hope this kinda helps a little bit.