If flavor is too strong you can simply add a little more of that ready mix (pg/vg/nicotine)... it works both ways... if you have 10ml bottle of juice with 15% of flavorings you can add 5ml of mix and flavorings will be 10% or add 10ml and flavorings will be 7.5%... for me dilluting too strong flavor is easier than adding flavorings because everytime you add flavor you have to wait a day or two for steeping and ratio of nicotine and pg change.
Starting with 15% flavoring and then diluting it down to an acceptable strength for her if/when it's too strong...only serves to use up more of the OP's premixed base to do it. She could also end up with a much larger amount of that mix than she wanted. Also, many people don't have the luxury of having as much PG, VG, and nic base, as others do. So working backwards to dilute, rather than adding tinier amounts of flavoring if/when needed...isn't always possible.
For example, take your own post above: "be carefull with mint(menthol)... even 2% is pretty strong... be carefull with sweeteners... marshmallow flavor at 5% can overtake many fruit flavorings"
But...she's supposed to use 15% flavoring when making her mixes, according to what you suggested. There are many more flavorings, like those above, that would need lots of dilution to get them down to an acceptable strength or to not be overpowering.
You said that the dilution method works for you. That's great! However, I can't count on both hands and feet the number of DIY newbies who've posted about how horrible their testers and/or first mixes have been. They're totally frustrated with DIY and ready to give up already. When we've asked what they've used to make them, most of them have been single flavor mixes, made with a % of that flavoring...that's been way too high.
Of course, it's the OP's choice how she wants to do it though.
ETA: Forgot to comment on this part - "everytime you add flavor you have to wait a day or two for steeping and ratio of nicotine and pg change"
Really? Many of us use Bill's 100DTT (or something similar) when we first try a new mix. While doing it, we adjust the flavoring(s) as we do the test. We don't wait days for "steeping and ratio of nicotine and pg change". We can do the whole test and end up with a modified recipe that we know tastes good...sometimes in just minutes, sometimes a little longer. We then use that recipe when making a regular sized batch.
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