Seeing him (his size) with a pinkie, 2 is plenty for one meal. (It's hard for me to advise based on weights- I'm one that decides based on visuals.)
And yes, corn snakes (& colubrids in general) aren't like BPs- they don't typically refuse a second prey item. So WE need to make sure we don't over-do their meals.
Oh I'm almost positive mine would take seconds if given the chance. Even after a perfectly filling rat he'll still keep watching me like, "More?"