Since 1.2.4 I think it's fair to say that the Self protection capability of the Tunguska SA-19 and Tor SA-15 have put a serious damper on the effectiveness of AGM-65's for example. This particular mission, with it's overlapping Sa-15 and Sa-19 and SA-11 mutual protection going on, now requires some serious thought on achieving the upper hand on Target Group Alpha on both sides, particularly using the A-10C.
How I've cracked it flying solo with the A-10C is, 1st Sortie on blue side: = 40% fuel, 6xGBU-12's, Pod. Climb to 30,000 and engage the 2 most Easterly Comms tower on the hills as per brief. Then ingress on a South West flight path and engage the final comms tower on the big hill (NAV1). With 3 GBU-12's lighter + spent fuel you'll have a bit of extra speed to run away from that inevitable SA-11 launch. Stay at 30. Drop below this in a panic when '11' starts singing and you die by SA-15/19/13. Just fly South-East after the GBU drop. You should be safe.
After the 3 comms tower are down this triggers the SA-11 destruction anyway.
For Red side, same story... just change you flight vector on the final comms tower to run parallel with the SA-11.
You know the rest....