First post, applying 2011 cycle. Thanks for the help!

My info:
LSAC GPA 3.81/UGPA 3.91 (Received all As, 2Bs, and one stupid freakin' D which did not count in UGPA because of academic forgiveness)
LSAT 169
Economics/Political Science double major, Philosophy minor
Large public university
Honors and completed a relatively large amount of research, junior and senior theses, research assistantship in department
President of two student orgs, held other leadership positions in orgs
Considerable amount of volunteer work (domestic and abroad)
Government internship in DC
URM-black
Side notes: Should I write a GPA addendum? Should I retake the LSAT in Oct?
Interested in T14, especially HS and UT