1) As measured by volume delta you mean? If so, I would tend to use it just the opposite as you have--a positive delta may very well indicate distribution; but, that's another can of worms and the reason I don't use delta for that purpose, only on a very small scale to see who's doing what on a particular bar.
2) How do you measure accumulation here, as you have no index volume information? Or, have you used volume information from the larger components of the indexes?
Ditto tortoise; I was about to say that I am grateful for this too; yet I have been learning patience since mid-december with this crappy volume and CAN YOU GET ON WITH IT ALREADY ES??!!?
Then I realized the irony present in the comment given the context, and so I retract my comment and back to the patience drawing board.
In all seriousness though, you're exactly right. It teaches probably the biggest challenge in trading (at least for me), and that is waiting.