The turret aiming properties are controled in the object's AI module:
Code:
Behavior = AIUpdateInterface ModuleTag_06
Turret
TurretTurnRate = 60 // turn rate, in degrees per sec
TurretPitchRate = 60
AllowsPitch = Yes
NaturalTurretPitch = 1
GroundUnitPitch = 40
MinPhysicalPitch = -20
ControlledWeaponSlots = PRIMARY SECONDARY TERTIARY
MinIdleScanInterval = 550 ; in milliseconds
MaxIdleScanInterval = 950 ; in milliseconds
MinIdleScanAngle = 0 ; in degrees off the natural turret angle
MaxIdleScanAngle = 360 ; in degrees off the natural turret angle
End
AutoAcquireEnemiesWhenIdle = Yes ;ATTACK_BUILDINGS; defensive weapon
MoodAttackCheckRate = 250
End
Removing the GroundUnitPitch flag should make the turret pitch straight toward the target.