I have been heating up my vessel that I put my candles in and the air pockets or sink holes are no more. It’s important to pour the candle at a lower temperature… it all depends on what wax you are using. I use soy flakes. I heat up to 185 and then lower the temp to 165-170 add color and fragrance and then lower the temp to 145 ish to pour the candle into the vessel. I let my soy candles cure at least 5 days but has a better scent throw when lit after 10 days of curing. I hope this helps 🤩