You are BOTH right:
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And since we are talking about that site; @ChelsB do you click on the "notes" bar to expand and read the comments? It will give you a better idea of how individuals are using it and can reveal some worthwhile descriptions. One user (MintyMods is the name) has a good write-up for this CAP flavor. He/she mentions using 4% single flavor and giving it a 28 day steep before they got a good feel for it.
I have always thought of it as such, but after reading the "note" I just mentioned, I am wondering.
I hope you mean you are simply cutting it with unflavored base and not making a complete fresh mix. It saves on your flavorings. If it were me; I would also be doing it to only a portion. If I had a 10 to 15mL trial batch to start, and I thought I wanted to try it at a lower percentage, I might only take 5mL of the original and add 5mL of my unflavored base to it. That way, if it is no better (or worse) I have only 10mLs of "oh well" instead of 20 to 30mLs.
Also, if you don't like it right away, and if you have enough spare bottles, I wouldn't be afraid to park it for a week or more and then revisit it later to see if it has changed at all. I know you have mentioned your impatience in other threads so I understand this can be challenging! But it really will help you understand your concentrates better.
Sweetener on sweetener (EM)? That wouldn't be my first thought... but I have seen (and mixed) recipes that do use both (Sweetener/sucralose and Cotton Candy/ethyl maltol) with success. If I were going to try that; I (again) would try it on only a portion. I also wouldn't do a lot of tweaking until I saw how time (steeping) was going to affect it. If I "needed" a "right now!" ballpark idea of percentage I would use the Flavoring Chart, that @Bill's Magic Vapor shared some time back, and I think I shared with you in another thread (of course this method will not tell you how the flavor changes over time). It may "seem" like too much work, but honestly, it is no more time consuming than what you are doing right now and a lot more methodical/thorough than the "lets go up some/lets go down some/lets start over" method and uses a lot less of your ingredients. Just a suggestion...
Thank you so much for the info. You're always so helpful! Yes, I simply added more pg and vg. I kept the nic out as I'll be decreasing my nic amount soon!