How's that one working out?
I noticed earlier you said you were using MBV with 5 flavor shots. That was a huge red flag to me, do you have any other
juice to test out?
About 4 months back I got an MBV order, with 3 shots (I think) on everything, and it was horrible. To be clear, I've ordered from MBV in the past, enjoy their juices for the price, but never got flavor shots. With the flavor shots all the juice burned REALLY easy, flavor was awful with a burnt flavor regardless of anything I did.
I felt like I was loosing my mind, I kept rebuilding and rebuilding over and over, getting incredibly frustrated because everything tasted terrible. I had been building great coils for awhile and then suddenly everything I did tasted burnt.
I finally realized it could be the juice causing the problem, rewicked and used a different juice, and the vape was perfect. For one reason or another, MBV juice with multiple flavor shots burns really really easy and doesn't work well with higher powered rebuildables.
I'd really suggest getting some different juice and trying it out. Rebuilding can be tough at first, but it's not supposed to be this tough. You've put a ton of time and effort into getting a working coil, best to make sure the juice you are using isn't causing any issues.