95% of throat hit comes from two things: warmth of the vapor (bigger battery PV's) and higher level of nicotine. PG vs VG, PGA and different ingredients in eliquid only account for the last 5%. Good throat hit is NOT a burning sensation which is all you get with additives such as pepper extract to site one example. I think you would have had to have vaped different PV's at 3.2 volts, 3.7 volts, 5 volts and variable volts and with different atomizers/cartomizers and different nic levels to experience the true difference in good throat hit. If you are only looking for a small increase in throat hit, then an additive to your liquid may do the trick. If you want truely good throat hit that is consistent, then you need a good 5 volt or variable volt PV. Low resistance attys are a good intermediate step to increase TH, but in my experience they do not hold up well and as mentioned before, cannot be used on certain PV's.