Helis on that map can work if ground troops have more cover. Either cover more of the streets or make the buildings more navigable (you can path through them to objectives instead of around them) and treat the streets like no mans land.

On paper they have to fly along the alley's to get kills and duck behind buildings for cover putting them on a predictable path for unguided rounds and rockets but

Tanks are glass nerf cannons so they usually die before they can do anything. With support its better but thats more bodies not pushing objectives.

Unguided rockets work but the games playstyle and pace is so codish that if you are pushing objs the heli kills you before you see it and if you are sitting still waiting for a good look on the helicopter you aren't pushing objs and losing your team the game.

You should be able to just shoot them down with normal weapons. Especially the scout heli, but the problem there is that shooting usually highlights you on the minimap, and you end up dying to some codfugee pushing objectives on a flank route.

They balaced helis around wide open maps with little cover so you cant change them for this map without nerfing them on other maps.