I was watching our flight for over 3 weeks and within the 2 wk period, the numbers barely changed--actually for the good and I didn't have to use an S2. Ticket sales don't change alot within 14 days due to advance purchase rules--you only have to worry about other nonrevs!!
Loads had been very IFFY but I went on Thursday and it was the Venice Film Fetsival wkend, as well. Otherwise, keep in mind that most of those loads are based on tour business. What are your #'s like right now?
In a real pinch--can you use Alitalia and connect thru Rome for CVG, ATL or JFK options? there are 7 am flights to FCO in ID96's for $40 ish/pax.

IF you're interested in upscale accomodations, ck out luxurylink.com for some outrageously fab places in VCE--we're talking upwards of $400 night for 2 but with superb suites/bfasts/taxes, etc.

I also suggest tkaing a peek at frommer's budget travel--they have forum and had an article this past year about renting "palazzos" in Venice.
Please don't hesitate to ask more. Happy to help.