I normally vape none menthol juices out of a rebuild-able drippier but when I got to work I take and ego battery with a T3s. The only problem is it tends to mute the flavor of the juice so I add a bit of premixed menthol juice to get a more satisfying vape. I know it would be cheaper but I've never dealt with making my own juice or dealing with flavoring. I was just wondering is it better to just add a few drops of menthol flavoring vs adding several mls of premixed menthol juice.