Personally, I’ve found that just upping the overall flavor on the sweeter flavors in your recipe helps cut down on putting additional sweetener.
Example: If you have blueberry, and candy… Rather than mixing some and adding sweetener to make it sweeter… up the % on the blueberry, and maybe a super minor increase in hard candy. I personally found above 12% on a 3MG freebase makes flavors muddle as well, I average 10% on any flavor, 6ish% on the main fruit, more if its the only fruit.
If the flavor just isn’t that sweet, consider finding another one, and using both to tone up the parts you like in them. There is always a way to make it work WITHOUT sweetener, you just need to make that a goal. (It will be harder on some profiles, but doable on most)
My juices so far have all come out relatively clear (fruity and candies for me) and taste strong and delicious, as well as taking quite some time to kill a coil.