My 2 or 3 cents for you:
Many of the slice & dice stuff that I have read suggests a slight value tilt, a 30% to 50% foreign allocation, and as many small caps as large caps. Your AA is not consistent with any of these. Some places to read up on all this are at www.fundadvice.com
and Bernstein's The Four Pillars of Investing.
You can get exquisite help on AA at www.diehards.org
where folks will practically manage your portfolio for you for free.
Specific suggestions: Increase foreign to at least 30% of equities, use the new Vanguard all-World, ex-US fund or ETF VEU. Use small cap blend index, not the growth index and increase it to at least 20% of equities (remember the international will have small caps as well).