Alaskan Thunderfuck (Fem) #tossed

So this week I decided to add the Epsom salt for the suspected sulfur deficiency & after a few days, I think some green was coming back. The PPM kept rising during the week so I decided to adjust the pH to 6 like suggested. I ended up adding a little more water & I forgot to add some Cal-Mag. Some of the leaves started to have some brown spots. Yesterday I gave her a haircut, got rid of the majority of affected leaves & continued LST. Yesterday I switched out the nutrient water with pH balanced water. I've been using the powder form of nutrients (MaxiGro series) all this time & am thinking of switching to the General Hydroponics Flora series which is all liquid. Maybe that would make it easier for her/me? Maybe now would be a good time to switch since there's only pH water right now. I bought some Armor Si which I plan to add in when I start feeding soon. Also this is an autoflower, at week 6 I thought there would be some pre-flowering by now. But I'm guessing BC of the issues she's been having the growth is slow/stunted.