I just conducted a test with 4 F16BLK52's, against a complete SA-10 site in 1.2.4 12913. The SA-10 engaged the first flight of two (the second flight goes back to the first detection circle), at 38 miles with 3 missiles. The F-16's engaged the SA-10 site at 36 miles with 2 AGM-88's. The first flight of two that engaged was eventually shot down due to them trying to press the attack to use guns as I gave them no further missiles besides air to air missiles (issue that has been reported). So everything seems to be just fine. The 2 HARMs damaged their respective targets but did not destroy them (issue that has been reported and being worked on).
So the only thing to report to the DEV (which they have already been reported) is the damage model of the Radars and the F-16's trying to press a guns attack when out of ARM's or any other Air to Ground munitions.