Leaning out at WOT

hey guys, what do i need to change with LT1 edit to lean out at WOT. Right now i have my Stock MAF with the screen etc in, and the O2s are reading high 900s at WOT. How can i get them down to around high 800s?
Thanks

95Z M6 (3.73s), Hooker Lts, SLP 2OTL



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Bolt-On 95 Z28 M6
See the Z (http://community.webshots.com/user/supasaint69)
LT1Tech.com (http://www.lt1tech.com)