I'll assume you're using the 316L SS coils since you listed 0.4 Ohms... But, like all coils (and juice), vaping is subjective to YOUR tastes, so I would recommend starting at a lower Wattage, say 15W... vape, bump up the power in 0.5W increments until it tastes better, and once you get a burnt taste, back off 0.5W... then you can fine-tune it in 0.1W increments (up or down) until you find what works best for the juice you are using.
All juices will vape differently in different tanks and coil combos... what works great at 20W in a Triton with 0.4 Ohm SS coil may need only 16W in a Subtank mini with a 0.5 Ohm SS coil... or it may need 24W? It's all subjective to your tastes and the juice, so start low and use the trial-and-error approach.
BTW, usually once you burn your cotton, the flavor of "burnt" may never go away until you change the coil, dump the juice, and clean the tank