if you put a 3.2ohm atty/carto you would get a lot, lot, less vapor and throat hit.
the hv atty/cartos are just a higher ohm. higher ohm = more power needed to heat it up but also more power it can withstand.
don't get it confused though, its not the same as regular atty on your ecig or even a lr atty.
3.2ohm on 5v is sick!
i don't use anything other than 5v now.
if you are happy with your current setup and arent looking for more th, vapor, (sometimes taste) then stick with what you have.