I've been looking into the SA-2's behavior, and it has a deficiency.
As far as I can tell, the SA-2 currently uses 3 point guidance. The missile tries to stay on the line of sight between radar and target.
The launchers are now set up to lead their target, rather than launching directly at them. This is a good thing!
However, the lead seems to be set up assuming the missile follows proportional guidance. Against a beaming target the missile will first need cancel out the lead. This often leads to missing targets at 8 miles or closer, even against nonmaneuvering targets.
The launcher lead would ideally aim to shoot at where the target will be in 4 seconds, since that's when the ballistic launch ends. The missile could then start guidance without as drastic post-launch corrections.