I love when plants bounce back. Praise Jebus.
So you have sufficient light now and not just 2x14w?
Well, I'll praise Jebus with you, however, that has not bounced back!
What ever changes you did in last 10 days stop, and go back to where you were 10 days ago...
Now you say your plant grew out of your grow box...
That sounds like heat stress...
Low Humidity....
Light Burn too close to lights....
Next time be more pro active....
Check your plant more often...
IDK... Looks done as in dead to me...
Hope you can save it...
Tips are light burnt... and Nute burnt...
Good Luck !