If the coil looks correct, has the ohms you expect and it dry burns evenly(Center out) no need to change.
Check and adjust or change the wick. Confirm coil height and clearance to positive deck.
If still harsh, you may have a bad mix. It occasionally happens. I have even gotten a blend that was so screwed up it stopped me from inhaling. Felt as though my lungs had gotten burned and took 3 days to get back to normal function. Not a nice experience.