That shit is crazy! I watched some guy get arrested out front of my house the other day...I thought they were going to knock on my door for sure, and I had just smoked in the house so...could have been bad news.
Glad your situation worked out ok too, despite all the mess and having to explain what happened to your kids...
As for the MH/t5 situation...84 isn't too bad, but 74-79 is probably better for the girls. I'd be more concerned with the quality of light from the t5's--while they are good, any High Intensity Discharge (HID) light will produce more lumens/watt, and has far greater penetration. But t5's are are fine, especially if you need to sleep! Edit: Because your plants are still seedlings, the t5's should be fine by themselves...
Regarding 24/7 light...I figure that in nature, the plants will never have that much light. Different biological processes take place in plants during their dark cycle, so I always figured its best to let them have a little night time. They plants still grow during the dark cycle anyway, so maybe save yourself 6 hours/day of energy costs. But everyone is different, and certain things work for certain people. You'll figure it out I'm sure.
And keep the plants as close to light as you can--just be careful as they get bigger, because they will grow into the light and burn themselves (one of mine last night decided to grow into a cfl...singed the tip pretty good, but no worse for the wear.
Keep up the good work!