It's annoying that a burnt taste is appearing when vaping on Aspire Nautilus. Below are suggested ways of addressing the burnt taste problem you may have on Aspire Nautilus.

Put a few drops of liquid straight down into the Nautilus coil before you install a new one. This will speed up the priming process and ensure you don't have dry wicking material up against the coil.

Once you assemble the tank from there, switch to the smallest airflow setting and take primer puffs until you stop seeing bubbles form in the tank. Let it sit for a few minutes then take another primer puff. If you don't see bubbles at this point you should have a fully primed tank and will never experience dry hits.