In addition consider mulling over the following additons: Cruelty, Deceit, Fear and Superstition. In which case you need 2 more sins to give each of the 'Major Sins' a lieutenant. Personally I would split Cruelty into Sadism and Spite. And Deceit into Misrepresentation and Lying. Which would give you your seven:
Deceit (open lying only however)
Anxiety (instead of Fear which is where there is an obvious perceivable threat, Anxiety is where there is no clear threat - bordering on Paranoia in some ways.)
Superstition (defined as 'Belief in things that one does not understand, to the point of giving money to frauds and spiritual confidence men')
Hope that this helps.