The fix for this is easy.
Easy fix, give them a bit more toughness for the helicopters, give them a fixed amount of flares that they can shoot as much of or as little as they want, and if they run out they have to return to base and hover over the repair/supply unit to reload. the issue is they make the strong, but they dont reduce the exposure time, so the logic is anti air rockets, but then because people fear the choppers so much everyone runs a igla becasue players would prefer to let recon kill tanks and engies kill choppers. Youre ballancing inward instead of outward. Make them violent, make them strong, but force them to leave the combat area to resupply. that is the balance, that is the forced eb and flow. Having a chopper duck low, to reload rockets and flares 100m away and you can do almost nothing because everything to kill them is nerfed to the nines. you want to really make dice mad? everyone run LMG's, a 4 man team chopping a chopper with lmgs, is super effective.