Help my little girls grow into BBW! Please help, droopy leaves! lots of info + pics

Indoor
Strain - "Kush" from seed
Day - 19
Medium - Pro Mix (3/4 peat moss + perlite & limestone)
Water - Bottled water every two days or when dry/lite
Temp - 80 F
Humidity - 46 %
Lights - 1 - 4ft 54W T5, 1 - 46W cfl, 1 - 26W cfl
Cycle - 24/0
PH - ?
Pots - 4" or so

The one in the first pic is one week younger and was started as backup after I unwittingly feed a week nutrient solution around day 4 to the other five.. It looks healthier than the rest which are drooping.



Questions:

What is the right time to introduce nutes? Three weeks?

How often does one feed nutes with watering?

Why are they drooping? Why are bottom leaves/plants yellowing? Nitrogen deficient?

Since they were fed nutes early is it possible they are drooping because they want more now?

Should I go to the hydro store and get good nutes or is Miracle Grow alright?

I have a timer should they be 18/6, 20/4, 21/3 etc... ?

Should I get a soil PH test kit?

When to transplant to bigger pot? What size pot? 8" ?

Thank you all for helping a first timer.

Chronicillness

1. I start using nutes 2 weeks after I transplant.
2. I feed with nutes every other watering.
3. You may be overwatering/under watering
4. No, I don't think that is why.
5. get nutes
6. 18/6 for vegging
7. I only check ph of water. I keep it at 6.5
8. You can transplant now or soon.

1) I start using nutes 1,2 weeks after trasplanting with 1/2 dose of nutes
2) Dont do soil, sry
3)possible ; overwatering/under watering,ph problems, N deficiency
4) No
5)Get PROPPER nutes, for veg and bloom, again -> dont do soil, cant help you here
6) 18h + lights a day for veg, 12/12 for flower,thats it
7)Get GOOD PH,EC (ppm) tester
Pot size; I would go from 3 to 5 gl
Have fun

Anyone else want to comment on the condition of my girls? Look a bit better today..