First Ever Grow - GreenCrack Auto

I have also lowered the light a bit, increased the nutrients to 2ml per 1000ml and watered about 4/500ml. I have also changed the light schedule to 20 hours again. Also I don't know why I have done the LST the way I have, i saw something similar on YouTube and the stem was bending in that direction one day so I thought I would give it a go. It might not have been the smartest move on my first grow but who knows, we will see. I am thinking about getting Advanced Nutrients BigBud and was wondering if anyone thinks it is worth it or to stick with what I am using the whole way through before flush?