the 5 inch pot is part ofd the problem, i know some will argue and some advanced growers can grow things in small pots but really the more area you provide for the roots the better it will be on the top of the plant. Ok new mexico has plenty of sun so thats not the problem. I would recommend you get a 10-15 gallon smart pot and transplant it to that. If you have the capabilty to make your own soil mix go for it otherwise get a quality soil and you should be good.
My area Central valley its hot today will be 101 with about 15 % humidity probably close to your type of weather. My plants in 5 gallon smart pots need water everyday, my plants in 30 gallon smart pots need water every 3 days. Based on that you can get an idea of what you should probably be watering. I wouyld hold of on the fert until about 4-7 days after you transplant lets the roots strecth some in new soil and thyen hit them with some fert. I would use fish emulsion but im doign all organic. Good luck man don't love the plant to death