Thank you, and apologies it is indeed .8 ohms so sorry to confuse the issue.
I appreciate the detail of your explanation regarding could resistance etc. Forgive me for my ignorance but in layman's terms exactly what is achieved other than power drawn from battery, by changing coils example i will be trying a .8 ohm to a 1.5 ohm and am currently using a 1.8 ohm. Please forgive me iff you feel you have already explained this, as i just don't get it.
A lower resistance coil will tend to give you a warmer vape. On a regulated device the difference may not be as pronounced since you set the wattage you desire, but there is a bit of temperature difference. Using the same wattage (25 watts to be exact) I actually get more vapor from my rebuilt kanger sub tank coils when I build them at 1.6 ohms, but my .6 ohm build is warmer and denser. What resistance is best is entirely subjective.