I hate cork oil pan gaskets and will never use one again. The one time I tried to use a cork gasket, I didn't even get it torqued down before it split and got spit out the side of the oil pan. I pulled the oil pan back off, removed the gasket, used RTV/silicone/whatever you want to call it, sealed it up, put the oil pan back on and it worked/sealed great.
Oh, and I don't use a ton of sealer, just a nice thin layer so it doesn't squeeze out when the oil pan bolts are tightened.