On June 26, 1991, it switched calls to WVTY ("Variety 96") and format to an Adult Top 40 approach, which in turn would lead to a Modern AC format ("96.1 The River") on November 26, 1997. New call letters WDRV would follow on February 27, 1998. On February 12, 1999, at 5 p.m., WDRV returned to Adult Top 40, this time as WPHH ("Mix 96.1"). On September 29, 2000, at 5 p.m., they switched to the current format and became the current WKST-FM, "96.1 Kiss". During its first four years, WKST waged a battle with WBZZ from 2000 to 2004 by countering WBZZ's conventional Top 40/CHR approach with WKST's Rhythmic flavor. In 2007, the rivalry resumed again when CBS revived "B94" and used the same conventional direction by going after the same 18-34 audience that WKST has managed to cater. However, B94 still could not compete with WKST-FM, and would switch formats again, this time to sports talk in 2010.