hey Billy,
I may not be the best person to ask, LOL. I started out vaping 18MG and within a month I was down to 12MG...which still suits ME just fine. If you feel that you need 24 that is your call. The flavoring used is the same, but may not taste exactly the same because the nic content alters the flavor. One thing you could do is order the 24MG and a sampler of 12MG HV (or samplers of both) to see if you could step down to 12MG comfortably. To me the HV 555 tastes great, but then again I am used to lower nic already. Hope that helps a little, LOL. BTW, I was not a big 555 fan at the start...it has quietly crept up on me and is now one of my favorites.
Ed