Having been following your thread since you originally posted, I think it may be time to go see the OS. The knee obviously doesn't feel right and you're concerned about it; you've also given it a decent amount of time to settle down. It does sound like it might be time to get it checked out. From what you've said it doesn't sound as though you injured the graft, but that doesn't mean that there isn't something else going on that you should be treating.
I'm mirroring you once again...had my first big wipeout on the slopes yesterday. Fortunately the bad leg didn't take too much of the impact, but I've done something unpleasant to the lateral side of the good knee which is a bit disappointing. The RICE routine never ends...