VO does not consider over all band. VO considers band in individual section (R, W, S, L); If all sections have points around 6/6.5 then you should be safe.
IELTS validity is for 2 years but VO considers IELTS taken with in one year, IELTS taken on 5 Sept 2009 would be consider by VO if submitted on or before 4 Sept 2010.