One tactic that works well, is to have the center (or those adrenaline crazed newbies) be the first to engage. The opposing forces move for cover and your "ghost flankers" can move easier and quicker with the enemies attention elsewhere. The noise of the firefight covers soft movements by the flankers, and the main force of the ambush can keep the enemy pinned down while the flankers attack from behind. In this way, you can use your enemies cover positions against him.
