I had tried MBV juice and found a few that I like and this last time i picked up some unflavored nic and some of their DIY flavors. I'm have trouble with the RY4 I started at 10% and didn't get anything close to flavor out of it and bumped it up by 5 % each time making 5ml samples each time I'm up to 30% and it still hardly has any flavor compared to the pre mix RY4 I got from them what am I doing wrong?