Are you playeing the vanilla game or are you using any mod? If vanilla you should have the silenced SR-25 and a ghillie suit, both very useful in this mission.
I usually split my team in two(I usually only have 2 or 3 mercs in my team), one doas the flanking manouver you discribed and the other team stays by the exit point. When you have 2 teams you can distract enemies and make the run in circles, just use loud weapons and supression fire from the exit point team, while the flanking team uses silenced weapons to kill most of the baddies.
I often use a scout to sneak into camp, crawling along the left side of the map until I breach the perimiter. Then you can attack them from behindk while your other mercs pick them off from a distance causing them to run back and forth.
Oh, and I always play this misison at night, otherwise they'll spot you too easy and your stealth/silence tactics aren't very effective.
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