The Dow Jones average of 30 industrials edged up 3.56 points to 2,072.37. But declining issues outnumbered advances by nearly 4 to 3 on the New York Stock Exchange, with 605 up, 789 down and 525 unchanged. Big Board volume totaled 114.88 million shares, against 141.54 million in the previous session. The NYSE's composite index dropped .21 to 150.63.