I've worked with C3 for several years and will give you a few suggestions to try. What works for one usually does not work for another lol! I temper C3 to help wax look smooth throughout its burn...you can find some great threads on tempering here. After I temper, I heat wax back up to 185*, add dye, add fo...stir for 2 minutes...pour when a slight film develops on top, about 120*. I do not preheat my jars but on occassion I do have to do a repour or use a heat gun to fill in any sink holes. Play with pour temp to greatly minimize the chance of sinkholes. In C3, for me, I prefer to use 8.5% fo load...anything above that and you run into seepage and wicking issues and 6% just doesn't do it for me for ht., let cure for 1-2 weeks. I use Premier and CDNs for wicking...they wok well with C3. Call Wick It (1-866-3WICKIT) and they will send you a generous amount of Premiers to try for free...think there's a $5 charge for shipping. If you like them, you can purchase Premiers through Aztec or Fillmore. HTH