This is something that interest me... I've been doing my liquids, I like them, and I always follow the manufacturer's/seller's instructions. For example, for Flavourart's flavours that everybody says are highly concentrated... They tell you to add only 3% to your mixes. But yesterday I was speaking with a friend who also sells devices and DIY liquids from Flavourart's flavours and he said something like this: "Well, you know, that's only good enough to cover the VG/PG flavour but it's too little. They tell you to add only that because they want to give the impression that it's all very cheap". I mixed a Flue Cured from Paradise vape UK at 8% and it was just fine. He said something near that to 10% in Flavouyrart's flavours would be fine. What do you really think of this?