currently the S3 is....... pretty good for normal usage, but when you get into a dogfight, they lose all purpose until the fight is effectively in your advantage, they can do qite a tight turn while their engines are up, but its burn time is low for a modern missile at 2-3 seconds, making it ineffective as an HOBS missile.
my suggestion is to either add a dedicated dogfight missile or buff either the s3 or the s2, giving it a longer motor burn time and increasing their drag as a tradeoff.