@VapeLuvr - You probably know by now that I like my flavors in the low range, but I'm going to go against my usual advice here and say I wouldn't be afraid to take this one higher. IF I was interested in a Cotton Candy vape. Which honestly I'm not.
However...I do see 3 stand-alone TFA Cotton Candy mixes on ELR that have at least one 5-star review each, and the percentages are 8%, 10%, and 12%. My feeling is that, as primary flavorings go, this TFA Cotton Candy is not a strong one, so those percentages don't seem terribly out of line to me. I have no idea what kind of coil-killer might result from this. I surely wouldn't recommend that level of sucralose-based sweetener, but this is not that.
Recently, there's been
this thread about cloning the discontinued Malty Toffee e-liquid from now-closed Backwoods Brews. The leading recipe, done with a lot of community input, called for THIRTY PERCENT TFA Cotton Candy. So, yeah, it's been done very high. Wow, huh?
So maybe try a 10mL bottle with 10%. Why not?