Since e-liquid is primarily PG, flavoring and nicotine, there is not a whole lot of other things/chemicals that can affect throat hit other than nicotine and warmth of vaper. This is an often debated subject. You can probably do a search and find some past threads about it.
Nicotine is definitely number one on the list of things that provide throat hit. If you take a draw off a device with 36mg/ml juice and one with 11mg/ml in concentration, I guarantee the 36 will have the stronger throat hit. Another component of throat hit you will likely not experience on an average e-cig, is the heat of the vapor. Manual devices and high-voltage devices can heat the vapor more than automatic devices providing more feel in the back of the throat and into the lungs.
If you mix your own liquids, adding some acidic components like lemon juice, vinegar or high proof alcohol has been reported to provide decent throat hit, particularly for those who vape low to no nicotine fluids.