What makes a great team is when it can constantly find way to get better even when things are already going so well. Doc Rivers  and staff worked with center Kendrick Perkins  to work on setting better screens and picks, convincing him that this would lead to better seals under the basket and eventually more scoring opportunities for him. The result? Perk scored a career high 25 points on Friday night, second only to Ray Allen’s 27 as the C’s (yawn-yawn) dispatched of the Chicago Bulls  126-108 at TD Banknorth Garden . Now, the Celtics  can match the team’s all-time winning streak mark of 18 on Sunday night against Quentin Richardson  and the Knicks at home. If victorious against New York, the chance to break it comes on Tuesday against another arch-rival, the Philadelphia 76ers .