Doesn't look like Nitrogen deficiency to me. The leaves are plenty green. And you just transplanted to a bigger pot, so unless that soil had absolutely no nutrients to begin with, you should be fine on nitrogen until the 3rd or 4th week of flowering. I'd invest in a bottle of fish emulsion from Home Depot. They sell the fish emulsion that has an NPK of 5-1-1. Those nitrogen sticks are not reliable because you don't know how much nitrogen they are putting out at a given time.
The bottom fan leaves are just drooping, which means either too much water, too little water, too much heat, or not enough light. My bet would be not enough light just because the fan leaves in the first picture near the bottom look shaded by the fan leaves higher up. I always trim off a couple top fan leaves if I have a Christmas tree shaped plant just to let more light get to the bottom.
http://www.homedepot.com/h_d1/N-5yc1v/R-100131259/h_d2/ProductDisplay?catalogId=10053&langId=-1&keyword=fish+emulsion&storeId=10051
As for watering....since you are now in a 5 gallon pot, water each time the top of the soil gets dry...not like desert dry but the top of the soil needs to look a lighter color than when it gets watered. In 5 gallon buckets under 400watt lights in my grow op (80-85F and 60-65% humidity), I have to water every day for my plants that are taller than 2 feet and every other day for those under 2 feet (flowering plants). I water with a 3 liter jug, fill it full and pour it into each of my 5 gallon pots needing water. The runoff after watering is about 10% of that 3 liter bottle, which lets me know that all of my soil in 5 gallon buckets got plenty water.