Coco is a good choice. You might want to look into Blumats as well. They will make watering so much simpler. I use a nutrient called Vitagrow which is similar to what you're doing using Jacks and Calcium Nitrate. It's three parts. A = Micronutrients similar to what Jacks Hydro is, Part B = Calcium nitrate, Part C = Monopotassium phosphate. Part a and b for veg and then add part c for flower. The only thing I add is some fulvic acid throughout the grow and Epsom salts a couple weeks into flower. Never have deficiencies or any issues. Sounds like you're on the right path for a simple, high yielding, trouble free grow. Keep it simple. You don't need a dozen bottles of overpriced products to grow good bud. You can buy powdered fulvic and humic acid online for pennies on the dollar compared to those twenty dollar bottles of premixed overpriced wallet grabbers.