ANAHEIM, Calif. -- Los Angeles Angels General Manager Jerry Dipoto stressed the importance of sticking to "our model" as the reason he won't pursue high-end free-agent pitching in the wake of an elbow injury that will sideline left-hander Tyler Skaggs through 2015.

Though it took several months and some key trades to bolster the bullpen, that blueprint for success is very clear as the Angels enter the final turn of a season that looked so promising in mid-July but has lost some sheen in recent weeks.

To reach the postseason and play deep into October, the Angels must get consistent -- though not necessarily overpowering -- starting pitching, stout relief from a deep and dominant bullpen and enough offense to out-hit any pitching deficiencies.

The rotation, despite Hector Santiago's early-season struggles and C.J. Wilson's current woes, has delivered for the most part, ranking sixth in the American League in earned-run average (3.76), second in opponents' average (.236), third in strikeouts (623) and fifth in innings (710 2/3).

The bullpen, despite Joe Smith's Sunday blip, when he gave up a three-run home run to Boston's Yoenis Cespedes in the eighth inning of a 3-1 loss, has been outstanding since July 1, sporting a 1.96 ERA, third-best in baseball in that span, and converting 14 of 15 save opportunities.

But the offense, prolific for 3½ months despite injuries that sidelined Josh Hamilton, Kole Calhoun and David Freese for much of April and May, has been inadequate since the All-Star break and is the primary reason the Angels' once-firm grip on a playoff spot has loosened.

The Angels led the major leagues in runs and on-base percentage at the All-Star break, but in 23 games since, a stretch in which they are 11-12, they're hitting an AL-worst .223 with 73 runs, an average of 3.17 a game. They're three for 33 with runners in scoring position (.091) in their past five games.

Even productive outs have been elusive. The Angels had runners on first and third with no outs in the fourth inning Sunday, and the Red Sox infield was at double-play depth, conceding a run.

But Efren Navarro flied to shallow left, with the runners holding. Chris Iannetta then struck out and Collin Cowgill popped out. Howie Kendrick also grounded into a bases-loaded double play to end the first.

"When you're not swinging the bats, every category will show as a negative, whether it's hitting with runners in scoring position or situational hitting," Manager Mike Scioscia said. "A lot of this is cyclical.