95% of throat hit comes from two things: warmth of the vapor (bigger battery PV's) and higher level of nicotine. More PG vs VG, adding PGA and different ingredients in eliquid only account for the last 4-5%, if even that. Good throat hit is NOT a burning sensation which is all you get with additives such as pepper extract to site one example.
If you want truely good throat hit that is consistent and “warm” not “hot”, 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 cannot be used on certain PV's.
One of the best 5 volt PV's is the GLV2 from:
Electronic Cigarettes and E-Liquid - Great Lakes Vapor but if you go this route, make sure to get the 5 volt model. Another less expensive but still good 5 volt option is one of Ken's 5 volt box mods:
Box Mods. Ken is also well supported just like Great Lakes and stands behind his products. With both the GLV2 or a 5 volt box mod, you can also use some of the new dual coil cartomizers that deliver good throat hit but really drain batteries fast so you need the bigger batteries that a 5 volt provides.
For variable volt, which provides you the most flexiblity and consistency, you can't beat the Darwin from:
Nhaler . Here is a more detailed review of the Darwin:
http://www.e-cigarette-forum.com/fo...ressions-newest-pre-production-prototype.html
So, if you couple a good PV with 24mg (or for some, even 36mg) nic strength liquid, I think you will get the excellent throat hit and you will be surprised at how much better it is than the little 510 you use to vape on.
Good Luck