Looks like the terra canna pro soil is a bit hot for this strain used same soil on last grow no problem but this time round its suffering nute burn and disfiguring of leaves
I don't understand what you mean by 6/2 light schedule? There are 24hours in a day. Most people veg under 18/6 (18 hours on, 6 off) but you can do on 20/4 or 24hours light. Your humidity is good. Your pH is good. Temps?