My bad, misread 2x6 in first post.
If you are going through all the trouble of new joists, I would change the ledger. Also typically you would solid block between joists at the girder.
Good on the vycor. Get it in between any aluminum flashing, and the new wood. The new ledger will destroy aluminum flashing w/o the vycor barrier.
This should answer most questions, including alowable overhang:
http://www.awc.org/pdf/codes-standards/publications/dca/AWC-DCA62012-DeckGuide-1405.pdf
http://www.deckmagazine.com/products/materials-hardware/beyond-aluminum-flashing_o
The two most common replacements for CCA — alkaline copper quaternary (ACQ) and copper azole (CA) — contain two or three times as much copper, in a chemically more active form. When aluminum flashing contacts this copper-laden lumber, the aluminum quickly corrodes. For the majority of decks, which are framed with pressure-treated lumber, aluminum flashing just isn’t an option anymore.