Await,
Honestly, the response seems like a form letter. And in this whole thing, what I've learned, is that there are no rules, and there is absolutely no rhyme or reason to this process. When I accept this (which usually happens for a fleeting moment) then it all makes sense.
I feel very similar. I was told that I would be notified by the end of this month. As time goes on, I feel less and less sure of a decision in my favor. I have mentioned on other threads that I was told by the director that they pick people from the wait-list that they deem complementary to the other students-- whatever that means. So, if I'm not picked, I guess I wasn't complementary enough.
I, like you, have thought about sending another email off-- but, what about calling? Do you think that will come off as too overly persistent? And do we really have anything to lose?
I am sure that the program you applied to had a huge applicant pool with experience in the field you are interested in. Perhaps, this is what they were going on, this process is truly a mystery. Good luck!