Justin Allgaier had a career day, leading 182 laps and sweeping all three stages in his win at Iowa Speedway.
The JR Motorsports driver claimed his seventh career Xfinity win.
After his second straight finish of 28th or worse, Elliott Sadler‘s point lead after 14 races is down to a four-point advantage over Custer.
The top five is completed by Hemric (-7 points), Tyler Reddick (-31) and Bell (-3).
After his win Sunday, Allgaier is sixth in the standings, 51 points back from his JR Motorsports teammate.