@fl3oo, im by far not a pro and just started my first indoor grow in a tent, but i might be able to give u some tips:
Try to avoid wet leaves when watering - if so, dry it with a tissue to avoid burning your leaves (lense effect)
I also think you couldhave started your LSTing your Mainstem in around Week 3.
Im always bending the Mainstem of my Automatics sideways in order to expose lower sidestems.