Whenever my son moved up a level - from 12u rec to 13u AA travel, then to 14U majors, then to 16u scout ball, it really took him a couple of months to adjust to the better pitching.
The velocity and movement increase. The pitchers locate the ball better. The pitchers have a better arsenal of secondary pitches. It takes tome to get used to those things. No matter how much practice he has had - it is never going to be the same as live game at bats.
You have to keep this in perspective. It's a 2 for 9 streak. That's really not all that bad. If he struck out and looked bad doing it every at bat - well then maybe he's playing at a level he isn't ready for. As it is, he is making contact. That's the hardest thing to do. Now he just needs to work on trying to make good contact rather than just survival contact.