Strange that your Bofors didn't flash up I've lost more aircraft to those cursed guns than any other.
SPAA I find requires some discipline and sticking to doctrine. If you have two, one should always be stopped within reasonable range of the unit it's protecting with some field of view, this requires sometimes putting the SPAAA in view of the enemy, at least from a distance. The other should moving to the next good site, the over watch unit doesn't move until the moving unit is sited. With any luck a turn after the Alert Unit moves the enemy will be wasting a barrage on where you are not. Of course once the battle is joined all units should pull back some, usually enough not to tempt them into firing at ground troops.
IMHO Bob out
