I also feel your pain ! I tried everything I could think of to get rid of the air caverns and the only thing that works for me is to pour in thin layers ( no more than an inch thick ) I did the poke relief holes and re-pour ( repeatedly ), tried different pouring temps., warming jars or not, mixing with other waxes, and all to no avail because I would still get the freakin air pockets. I was playing one day with making different colored layers and noticed a complete lack of air pockets. Pouring in layers is a pita but it works.