CC's have ticked down to the lows of the day at 99-28 owing to ongoing equities strength.  If you have to lock with a few days it could be an indication to lock now, but if you agree that the strength in equities is owing to a stock euphoria resulting from an innocuous fed statement and the "the morning after" will bring equities back down, you might still float despite potential late day reprices for the worse.

All that remains to be seen is whether or not MBS get the bid over treasuries and can tighten up on a spread basis (they have to some extent already, but nothing definitive)