[ Finishing up a burn test with the Fruit Slices one and been really happy overall. Great throw, good melt pool, etc. The only issue is that the wick has been mushrooming pretty bad during a 4 hour test burn (yes, we trimmed it to 1/4" before burning...). Oh, the wick is the 51-32-18Z (zinc core wicks). The mushrooming in your case is from letting it burn too long. I tell my customers to watch after about 1 1/2 hour to 2 hours, they will see lite stream of black smoke coming up, that is a sign to blow it out, trim the wick and relight it. If after doing that it still smokes then you need to look at overscenting or wrong size wick. Hope this helps.