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When casting my F.C. golds, Ive been getting small pits..usually on the surface, so they can be rubber wheeled and polished out..but they shouldnt be there. Generally near the location of sprue attachment, but can be scattered elsewhere. Im familiar with casting porosity and im quite sure this isnt the case. I believe Im using clean wax (although Im leaning to be suspicious that this might be the problem),investing with whip mix beauty cast, burning out multi-stage with final temp at 1175-1200 F*. 1.5 turns on a kerr centrifico broken arm casting machine, clay crucible, propane-oxy, multi orafice tip that I take off and clean inside daily. Alloy is Jensen JYE: 52 Au, 24 Ag, 18 Cu, 5 Pd. It has also happened in my econo silver alloy, invested with microstar, 1300 F*.