Hi I am new to the forum and am also having this exact issue. I agree with you in describing a mottled appearance. I have spoke to two different suppliers that I order from, one suggested it's a fragrance oil not being blended issue, and the other one said it's a temperature issue. I also have tried pre-heating the jars, pouring slower, pouring cooler, pouring hotter, pouring faster. Nothing is working. I use 464, heat to 185 add 7% FO at 180 and have tried pouring at 115, 120, 135, and 140. I would also greatly appreciate some help with this issue. I thought at one point it was a problem with the wax, may I ask you which supplier you get your was from? I just ordered a new batch of wax and am going to see if that's the problem, because on my first box of wax my candles did not have this problem, so I will let you know what happens.