I think the 3 keys to a strong throat hit are:
1) Juice and its nic/flavorings
2) Size of e-cig (smaller = hotter actual vape when it hits your mouth, closer to a real drag, but heat can hide the flavor more)
3) Switch on your e-cig (full control manual of atomizer/ crappy auto switch with short cut off/ nice auto switch with long cut off)