Why is my performance so bad?

I have a yamaha vstar 650, I have vance and hines short shots and a K&N air filter. I also cut some holes in my airbox to increase airflow. I had my bike carbs rejetted and Dynoed today and peak horsepower was 30 and torque was 35. I was extremely dissatisfied. That is lower than what the vstar 650 is supposed to get stock