I have personnaly found a huge difference in the amount of scent throw and the type of wick used. When I was using zinc wicks for my soy/par blend, I was very dissapointed in the hot throw of my containers. I found that they required a long cure time to get ANY kind of a good throw! After lots of reading here, I decided that maybe the zincs weren't buring HOT enough for my wax blend (I was using quality oils as well, and definately enough of a FO load!) I started using CD wicks (Heinz coreless) and lo and behold- scent throw at last! Now, I'm not saying that this is magic by any means, and we definately test each combination of wax and FO- but on the whole, I am getting a much better, AND a much FASTER throw, by using the hotter buring wicks in my particular wax. That being said, with straight paraffin, however, you should be able to use zincs, as long as you're achieving a good melt pool, and are using quality oils as AJ said, you should be ok... HTH!