Welcome to the ECF! NIC strength definitely affects throat hit, but not vapor production. Increased throat hit can also be achieved with higher voltage, and certain flavors and devices.
Madvapes delivers pretty good juice at excellent prices. I've been stuck on their RY4 and Tobacco for a couple of weeks now. It's not the best I've ever had, but I definitely like the flavor and it has a great throat hit. I also liked some others like Grandpa's Mix, Rasberry, Caramel and Mad Chai from Mad Vapes, but they only suit me for occasional vapes.