Super Critical Auto

And yes, your right, all LST does this early is stop the natural shape then you LST. unless you goal is to grow the plant from the ground but that involves anchoring down nodes, that's extreme. But I'd wait. And if space isn't any issue I wouldn't even bother with LST until it start to effect the light hitting bud sites and so on.

Looks as if it was over watered a bit in the beginning. Your PH is a bit high for soil. I'd aim for aorund 6.5-6.8 vs 7.7 If you using liquid nutrients it best to get an EC pen to confirm its concentration. Blind feeding can work sometimes but if problems arise its a very useful tool to help troubleshoot the issues. Its looking like some PH issue to me but also maybe combined with magnesium. Fix the PH first and go from there. Then check EC of your feed and confirm it has the ratios you want. I'm not seeing the NPK content or what fox farm nutes you are using on your diary. you want to add that in. Best Of Luck!