Throat hit is a product of nicotine. Higher nicotine = more throat hit.
Some things can enhance TH- more PG, menthol, higher voltage, some flavorings
Some things can minimize or give a smoother TH- more VG, some of the sweeter flavors, lower voltage, tanks/clearos.
You don't want to fool too much with nicotine or you'll have cravings. Adding too much VG will make your e-liquid thicker- not good for every delivery system.
Vaping isn't like smoking. It's dehydrating.