Oil leaking into spark plug wells

I recently checked my spark plugs to find there was oil pooled up in the first 3 tubes (left to right). There was absolutely no oil inside the cylinders, just the spark plug tubes. I've replaced the valve cover gasket and the tube seals but oil is still making it's way into the wells. Both surfaces were clean before the gasket was put on and everything was torqued to spec. Other than taking the head off to replace the headgasket, i am unsure what else to inspect/replace.