Welcome , You mention that your making a 2.3 ohm atty , but as said above , if you have any hot spots , could cause the burnt taste . Often we make too low of a resistance , so not able to
vape with very high voltage . I use a Penelope , amongst others , and typically my wicks/coil only come out to about 1.7 ohms . So I just vape it at 3.2 to 3.5 volts . Works fine . As long as you get good taste / vapor , your good . But as to the Phoenix , and clones , I have not had much luck with those . Had same problems with burnt taste , so I quit using them . You will probably have better luck , with a better rebuildable . But that's only my opinion . Good Luck