@Fidola13, I have to agree that depending upon what atomiser you use and personal preference do affect what coil build you use.
I'm running an Ammit 25 with a 6 wrap 27 AWG (0.34mm) SS316L coil at 0.65 ohms, as it doesn't really like a high mass coil it seems.
And a Tauren SOLO with a 6 wrap 25 AWG (0.68mm × 0.27mm) SS316L flat wire coil at 0.32 ohms, and it doesn't seem to mind it at all (it's got lots of airflow).
I'm running an Ammit 25 with a 6 wrap 27 AWG (0.34mm) SS316L coil at 0.65 ohms, as it doesn't really like a high mass coil it seems.
And a Tauren SOLO with a 6 wrap 25 AWG (0.68mm × 0.27mm) SS316L flat wire coil at 0.32 ohms, and it doesn't seem to mind it at all (it's got lots of airflow).