Your temps are fine, a little low, but nothing that will hurt the ladies too bad. Especially considering they look like hearty indicas.
Your plants don't look too bound yet, but they could use a bigger container. I found when using coco, i like a 50/50 coco and perlite mix, and i use fabric pots to help combat drainage issues, and to prevent plants from getting rootbound.
Everyone does things differently, so I am just telling you what I do, not what you should or shouldnt do.
My nutes that I use are synthetic, and i do not have to supplement with cal-mag because i use tap water.
Usually I water and feed every 2-3 days depending on the weather and how fast the girls are drinking.
My watering schedule is like this, if using a 1 gallon container, i would first water with 2 gallons plain water, once that has ran through, i would feed until i saw runoff with my Nuted mix, which varies depending on stage of growth.