I responded in an earlier thread that you made concerning a flooded coil and then a burnt taste with your AIO "fixed voltage" battery device. I'm pretty sure that you're still experiencing the same problem as before.
Need help
You may get different results with trying different coils in your battery device, but I'm thinking not much is going to work to solve your problem. The main problem you have, IMHO, is your entire setup. It's for sub-ohm vaping, and I suspect that you are not a sub-ohm vaper.
PBusardo did a really nice but really long video on a setup almost exactly the same as your setup, the Innokin Endura. Although overall he thought these devices are superb for new vapers, he believed
there would be a segment of owners who would get a harsh vape from this type of setup. My daughter purchased one of these and was very dissatisfied with its vape. Unfortunately there's not much that can be done to correct it.
Your setup is a direct-to-lung (DTL)
sub-ohm setup. They provide a vape that will appear to be "harsh" or "too warm" to many
new vapers.
You will likely need to purchase a new setup better designed for a new vaper. One which allows for the use of a
mouth-to-lung tank which has a tighter draw and
uses higher resistance coils and a
battery device which is variable wattage. Something like this: