Jacobs Pavilion at Nautica appeared to only be half to three quarters full for last night’s Jane’s Addiction concert. But that didn’t stop the band from putting on a terrific 90-minute show. While the theatrics have been scaled down since the arena rock days, the group still employs an ensemble of dancers and costumed actors who provide a circus-like element to the live performance. But that’s not the real draw. Rather, it’s the fact that the band, which features all original members except for bassist Chris Chaney, has real chemistry.