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I have a pastel face hen and what looks to be a gray male cock. They've had three pastel faces (2 males, one female) and one plain gray male.

Does that mean the male is split to pastel face?

Yes it sounds like you have a male grey split for pastelface heres your results on chicks you expect if he's a split for pastelface

Mother: Pastelface

Father: grey split to pastel

Male offspring: 50% grey split pastelface
50% pastelface

Female offspring: 50% grey split for pastelface
50% pastelface

http://www.kirstenmunson.com/cockatiels/blue.html

Thank you!