Has anyone actually gotten an R yet from this school? If so, then you might actually still be in the running for an A, since you haven't received one. If not, then you might have already been rejected, and you just won't hear until later in the cycle, if at all.
Unfortunately, you are at the point in your cycle with this school where the only thing that might be effective is an update letter, which you already sent. Send another one if you have any thing significant to say. Otherwise, it is what it is. Love letters or non-binding letters of intent before the school has expressed any interest in having you as a member of the class (through being put on a WL), as you have seen, are ineffective post interview while they are seeing and accepting others.
Can you name the schools without compromising your anonymity? If so, that might be helpful.