I don't think it's your wax. You can always call Morris and ask. They know their stuff there and will try to work with you to reach a solution. My thought is like what several have said to you about the heavy oils that have vanilla in them. IMO on them, why not try melting the wax and then adding the oils to your wax at a reasonable temperature ..., maybe even at 180-185. Give these type of oils a chance to bind with the wax. The heavier oils you should be able to cut back on your percentage as is. It takes more to time to mix heavier FOs into paraffin. It is possible that you could try warming the fragrance before putting it in the wax. I have had certain oils from other suppliers that sludge on the bottom in my paraffin. Vybar helped some. Vybar helps to bind fragrance to the wax, but even if you got some to try, I'd ask Morris what to use if you continue to blend a pillar/votive wax with a container wax. There are two types of vybars. One is made for the harder waxes such as a pillar/votive blend and the other is for softer waxes ... i.e. container. Then again, maybe I'm not remembering right, but I thought you were using 4784 with 4786? As for the solvents in fragrance oil ... I don't think anyone knows exactly what's in there. DPG though cuts fragrances and I do trust Carol K's opinions. If she says they aren't cut, I would believe her. Vanillas can be difficult to incorporate into wax. Another alternative (and a possible PITA) if you do not want to change your method to accommodate heavier fragrances is use half and add the wax, get it to blend/bind and then add the other half once it is. The temperature of the wax can make a difference when adding vanillas, at least in what I have used or tried to get FOs to marry with the wax. Too much and you won't get it to combine unless you can use some vybar and more wax. If you try an alternate method though I would be interested to read what happens. I don't blend the two together, but if I'm not mistaken, I thought 4786 had difficulty with throw on some fragrances too. Just seemed I remember that from a few years ago.