Watering is easy. Just soak the pot and don't water until it's near dry. Even those seedlings already have a tap root near the bottom now and half the pot can go dry before they need water again. Starting in smaller pots is best for regular photo-period plants.
I do wonder why you don't have those autos in full pots? I've only grown a few autos but most of what I hear is that they should be started in the largest pots they will ever live in for the best yields. Like a 5gal is supposed to be pretty good. I will be growing some outside this year and have a raised bed the wife has been growing all sorts of stuff in the last 10 years for their home. I'll be out there rottotilling when the tiller is still chewing up ice adding our home-grown chicken compost and other goodies to give them a good home. Hi-CBD fem autos by Sebring Seeds called Earth Lover.
I'm way up in northern Alberta and photo plants don't start flowering until mid-Aug and we often have frost at the end of Aug so they never finish. If I could afford a blackout greenhouse I'd get one. The wife changed our DIY greenhouse into a chicken coop while I was out of town for 6 weeks dammit! lol
The bigger ones look nice and healthy so you must be doing something right!
