Di, I have not tried your HV Atty, and I usually don't do 5 volts or higher, but some may not understand the advantage to using this atty. So, here are my free comments
a 3 ohm atty running on 3.7 volts will draw about 1.2 amps.
This will provide the user with
4.5 watts of vaping power. (watts makes vapor) Enough for me.
Your 4.5 ohm atty running on 5 volts will draw 1.1 amps but will provide
5.5 watts of vaping power, and running on 6 volts will draw 1.3 amps of current but will give the vaper
8 watts to blow smoke. Some may evaluate the current and not the power dissipated. Not much difference in current (1.1, 1.2, 1.3),
but a big difference in power. Sort of like miles per gallon and horsepower.
Economy car or muscle car.
What makes vapor?
Watts.
Rocket