In the pic in the previous post, note the intersection of the trigger guard and the grip's support for the 2nd finger. The grip blends in with the rear of the trigger guard and prevents knuckle rap. It's the fix you're looking for if it's knuckle rap you're having trouble with.
Smith and Wesson K Frame factory vintage target wood grips will do nothing to prevent knuckle rap...as they intersect too far up the frame, creating a 90 degree angle between the rear of the trigger guard and the grip, which is perfect for hammering your 2nd finger.
Eagle & Altamont offer good looking grips that may work out for you. Both, to me, are smaller than the Smith Target Grips of current and long ago make, but do offer a grip/trigger guard radius that helps with knuckle rap...with really big hands however, either may be smaller than what you need.
Those X-frame Tamer types, for a "K" framed, M66, would be my #1 choice....fugly, but a good shooting grip! Be sure to check if you've got a round butt or a square butt before ordering. Current S&W production is all round butt to my knowledge in their revamped M66.
HTH's Rod