IMO muscle soreness is no type of sign of muscle growth. Muscle soorness is only tiny mico-tears inside the muscle. Once you start working out week by week soreness seems to go away. Pumps aren't really a sign of gains either, pumps are just fluids pumped inside your muscle.
If your outter chest is being worked perhaps you should switch to a closer grip. Wide grip is gains to the "outter portion" of the chest which pushes, and if you would go a closer grip perhaps shoulder width it would be more inner chest.
http://thefitshow.com/week3/milos_chest_med.htm