Hmmm interesting. What do they consider a high level of fo, your wax has specs for fo load, so are you wanting to add more fo than the specified amount? You will need an additive for that as well. You will run into more problems if that is the case. If you are buying good fragrance oils you will be able to cut back on the fo load,with good results. Do they specify a wax that these wicks work best with? A candle is more than a wick, sooooooo I would be cautious of their claims, as it is the wax, fo,dye etc... alll of these things are going to have an effect on your final product. You don't want to overload your wax with fragrance oil. That is not to say that it is not a good wick, or do some testing with them but at the same time I would not purchase a wick just so I could add more fo to my wax. Hope this is helpful. There is alot of info on fo load in this section.