It's never a waste of time to try. Besides, you are still outside the 7 month window, so even if there isn't something at your home resort, you could wait list. Something could open at the 7 month window or you could try the other resorts then.
Our first trip we called right before the 7 month mark and were able to get a 1 bedroom without problem. I don't know if the studios are in higher demand or not but it is worth a try. Like HBC said, as long as you call before 7 months you have a good chance.