Done a bit of that stuff myself. The punch line is, the more lift the a/c needs to produce to stay airborne, the further you stay away from it (behind and below) If you fly close formation in a vic position and the lead increases the g-load during a maneuver, the downwash from his wing increases and you tend to roll towards him, if you do not counter the effect. So, if its big, stay beside, above or infront(not when its faster than you)