My first guess is your coil.
1. Have you done these coils before? Do you have silica or anything where you can try the eliquid on something other than your coil? Is the eliquid a different PG/VG ratio than you're used to?
2. Does it lessen if you drop the battery down to like 3.3v, and do some primer puffs?
3. Play with the cotton in your coil -- chances are you are rolling it or something and the eliquid isn't able to get to the coil in the way it needs to. Hence, you're burning your cotton or getting severe dry hits.
1- Yes, been using this build for a good while now with the best results on other brand tobacco and dunhill menthol flavors, also 24mg. I am afraid I don't have a ohm meter (shame on me, but trust me, in my country it is very difficult to get one... if I order abroad I am lucky if I get it in about 2 months.. but from several android apps I have found my build should be around 2.4 ohms) along with the liquid I bought a new evod today and a Silica 1.8ohm factory coil, and tried it at 3.2V and still the same burnt flavor
2-No matter the voltage... I tried from 3.2 up to 4.0 (3.2 is the minimum on my ego twist batt) and to be very honest, it felt better on higher voltage
3- I have sincerely played with cotton wicks for a good while and I honestly feel I am kinda good at it, I tried both with a thick wick and just now I am trying a very thin/loose wick and I stil feel the same burnt flavor
NOTE: I am vaping a combo of about 30% Dunhill menthol and 70% LIQUA Cappuccino and it feels Ok on lung hits.. mouth to nose.. It smells like burnt plastic
Yet another edit... Unfortunately none of the liquids I've vaped specify the PG/VG ratio ...

from looks the are about the same thickness