You're welcome. Glad I could be of any help.
Wow! I didn't realize your set-up was that low. Your set-up is you described is running just under 9w to 10.5w. You are running these way hotter than what ever would. I have found that generally sweeter juices like to be at or below 8 watts, usually between 5-7. With tobacco's I have found I like them around 8 watts. Keep in mind that this is only my opinion on the BWB flavors I vape.
I still don't know how these ultra low Ω folks think they are actually "vaping" juice at 15-20w. That ain't vapor they are inhaling. LOL
This might be the culprit of your missing flavor. I know with some juices if you go to high the flavor drops off and shortly beyond that you start burning them. I would think at your 4v (12.3w) you'd have to be burning the juice. What did you think of it when you cranked it up like that?
As far as my current set-ups and brews,
I have my D20 set-up with ceramic wick with some "special" BWB brew in it on my full sized Provari V1 right now. As soon as the tank is empty I'll switch over to O-Julius or some other sweet brew like MT or Cheesecake.
My little all day mini D14 & mini Provari V2 is set-up with a SS wick and all I ever vape in it is Casa. It's been my 24/7/365 brew of choice for over 2 years now. LOL
My current coil on this SS wick is a 4/5 32ga Kanthal @ 2.5Ω running at 4.0v. I need to remove a wrap on this set-up. I forget how the hell I have the Ceramic set-up. LOL It's been a while since I've had to mess with it.
I have other miscellaneous set-ups floating around with different brews in them but those are not gennies.