Several variables to solve your TH question:
1. Nic level (higher increases TH)
2. PG/VG - Higher PG increases TH
3. Delivery device in order of best TH: RBA/RDA's, Carto's, Clearos
4. Wicking in order of best TH: Mesh, Ceramic, cable, cotton, silica
5. Power: You're atomizing the juice, the amount of atomization and heat play a factor. Sometimes, upping the power will improve TH
6. Resistance: in the right setup, lower resistance coils can provide some doozy TH
7. Even Vape Technique can change the TH
This is subjective, so everyone will have a slightly different take on this. Many Vets I have conferred with say you need about 12 - 18 mg to get a good throat hit. You can reduce this a bit with all PG, or even higher PG ratios, and certainly, RBA/RDA's can blow your head off with the right coils, and at lower nic levels, particularly with low Ohm coil setups.
Welcome to VapeQuest. You have the ingredients. You just need to do the mad scientist thing to see what works best for you. Certainly, there is a combination that will allow you to get a great TH with less nicotine. Of course, what's so bad about a little nicotine anyway? Well, that's another thread. Good luck, happy hunting, Power Up and Vape On!