You say it's not over watered.....are you letting the top couple of inches completely dry out before watering again? Do the pots "feel" light when you do add water? Plants look reasonably healthy to me.
Ya, long as your temps stay under control and you water good before you leave I wouldn't worry about them at all. Almost all mj strains like a really arid environment and can tolerate it being quite dry for several days or longer.
The pale color looks like they could use more nitrogen. Not sure how much is it those nutes you are using. As far as the temps, I'm sure you prob know the answer to that already. 58f overnight is a little chilly. I would try to raise both day and night temps some if possible. Good luck man.