Red Lobster’s latest attempt to revive its once-iconic Endless Shrimp deal is drawing a more subdued response than expected, with early data and in-store observations suggesting the promotion is no longer the traffic-driving force it once was. During a recent dinner service at a Los Angeles location, the limited-time return of Endless Shrimp drew a steady stream of customers, but not the overwhelming crowds that had previously defined the deal. Large portions of the dining room remained unfilled, and service avoided the bottlenecks that once plagued kitchens. “It’s been popular,” one server said to Business Insider , “but not as popular as I would have thought.” Roughly a third of diners opted into the promotion, while others chose similarly priced menu options. That shift is now backed by broader performance data.…