1. Hit ball lock behind vengeance target
2. Target comes up and locks ball
3. Target drops just enough to kick the ball back, but comes nowhere near dropping all the way down to release the ball
4. Generally this happens anywhere between 3 and 20 times before it releases the ball properly
I just replaced one of the vengeance optos, but this doesn't really seem like an opto problem anyways. Maybe the coil that drops the target is not fully functioning?