WYW oils are supposed to be highly concentrated, but it depends on the actual fragrance itself, some are way more stronger than others. I have used WYW fragrances at 4% and up to 7% in J223, and J50 both paraffin blend with great results. Some fragrances are just stronger than others, if you can get FO shipped from BCN then order some of theirs also, like blueberry muffin, strawberry jam, they are both strong and work well in both paraffin and soy.