Hard to say what you will like, coming from commercial juices, I guess starting on the high side makes
sense, although it MAY be too soon to say whether or not you like your
juice until it's steeped some. It may change as you use it, and it steeps, or even as your tastebuds change a bit as you DIY. I have very few mixes where the flavoring percentage is above 10%, maybe a few and I'm a reluctant sweetener.
I would probably suggest mixing in less volume in the future for your next mix and some steep time etc. But, I'm glad you are enjoying what you are
vaping NOW and hopefully some aging time will improve things, not worsen them. I guess the good news is, if the mix becomes too strong, dilution shouldn't be too hard since you are finding the flavors fairly well balanced (although that may also change as the mix ages.)
Best of luck and I'm glad it's working out for you.
Anna