I probably would have cried if it saw the temps etc...never as bad as you think. I have had plants bent over and posts light as feathers and they still bounce back
I like to repot when they have a nice root system almost bound by the pot. Then transplant to my final pots and give them 2 weeks to root out before flip. Usually 5 weeks from seed or 3 to 4 weeks from cuttings
Easy enough light there mate. A 600w led puts out a lot more lumens than a 600w HPS. Go low on the nutes, 25% like @Wizzle said. I run a 1.2m x 1.2m tent with 4 girls and a 250w led. Gives me about the same results as a 600w hps maybe slightly less. Another tent of 1.5 x 1.5 with up to 9 small...
Defo autos. Switch to 24hr light if you can. They will pack on more weight and do not need any darkness. Feed 0 25 to 0 5 strength of nutes as usually don't need much feed and don't really have time for any major setbacks. Hope that helps
Wouldn't worry too much, they are tough mother effers for sure. I have had stems split worse and end up like tree trunks...even had a hole in one once, couldn't put a pen through....grew fine and healthy. You may find she takes week or so to recover but the knot that is formed will add extra...
Day 57 from flip? If so probably two weeks left. Check the trichromes and see if they have started to change from cloudy to amber. If they are you are close. Any still clear and she is no where near ready IMO