Do you want to help your son.
Do not discuss the K's.
Check for the front shoulder.
If it turns early then the eyes do not follow the ball across the plate.
Tell your son to hit the ball with the front shoulder. Each strikeout is information gathered for the next AB.
When we travel to Australia, Japan, China, Korea, I interview the players as to the location of their "hard hit" line drives.
The International pitchers watch our BP and then adjust their pitching. Yes, they are that good!
Where is the dominate eye? Is he a L or R hitter?
Bob