Lord knows I love my butter, but for absolutely delicious corn on the cob, you've gotta try it this way:
Regardless of how you fix it -- in the husks on the grill or boiled -- SKIP the butter altogether and squeeze some fresh lime juice over the corn and top that with some FRESHLY GROUND black pepper. (You want the pepper freshly ground because that preground stuff has anti-caking agents and other gunk in it that messes with the flavor and causes tummy upsets in some people.)
Corn, lime juice, freshly ground black pepper
Easiest grilling recipe in the world and wonderful!
(FYI: I'm the author of
Lazy About Grilling.)