Yep, waaaaaaay too much nitrogen/nutrients..........baby plants need baby feeding.
Plastic pot is not an issue, but heavy soil is.
Damaged leaves will stay damaged, and yes, age determines flowering in autos, not health or size..........stick with easier to grow photoperiod fems in future would be my advice and ignore the hyped up autoflower advertising.
Plain water for 7-14 days will help recovery.