Your post hit the nail dead on. That said, as a veteran of Desert Shield and OIF3 I can say I saw changes in helo tactics first hand. In OIF we are fighting an insurgency meaning there are no front lines so yes, the helos move constantly in order to minimize their chance of gettin hit, at least most of the time. And, the Apache pilots would not hesitate to use a hellfire on a toyota if it meant destroying the enemy's ability to fight. Heck, hellfires were used on dismounted insurgents. That saved American lives, so cost was not an issue.
In Desert Storm Apaches would generally hover at a moderate altitude and pick off tanks at their leisure. Plus, the Iraqi armor did not generally have night vision capabilities and their maximum effective range was approximately 2500 meters give or take compared to the Hellfires 5000 meters.
Now, one option in black Shark could be to edit the enemy ai visibility distance, or edit their competence.
Regards.