You should be getting plenty of nicotine since tank attys use up juice quickly.
if you are looking for more TH then use LR atomizers or cartomizers on what you have instead of using the tank atty and tanks. And make sure your juices are high PG like 80PG/20VG or 90PG/10VG.
If you want more nicotine, shop somewhere with higher juices.
If you are looking for some kind of cigarette head buzz, ecigs don't have carbon monoxide, formaldehyde, cyanide, carpet glue or most of the 4000 things cigarettes have.
He's not getting what he needs from the model he has and is asking for a better model not the difference between smoking and vaping. I know you are against anyone using a 5 volt or variable volt model because you have never used one, but there are thousand of vapers who find many advantages to these models.
As others have suggested, a good 5 volt or variable volt model will provide you much warmer vapor and consistency. There are many good ones and here are a few that have gotten many good reveiws:
5 volt GLV2 which comes with a lifetime warranty and is well supported on this forum:
Electronic Cigarettes and E-Liquid - Great Lakes Vapor
In the same category but less expensive is a good 5 volt box mod:
Kens Boxmods
Variable volt or varialble wattage, I would look at the Darwin or Provari as mentioned already:
Nhaler
With the Darwin, for example, you will get excellent warm vapor and throat hit as well as excellent consistency because it uses "boost circuit" technology that keeps the power to the atty or carto consisent even as the battery drains.
Good Luck