I had someone on the inside hustling pretty hard for me. 2 meet the chiefs. The second time round I was less nervous and they liked me more.
I got a call about 3 weeks after my second one and have a class date on the 11th.
Just keep trying. As far as I could tell, meet the chiefs was around the Thursday or Friday on the third week of every month. If you go to enough of them you'll get your call. I had 10 hours over the mins when I first applied.
After every meet the chiefs, just email the email back and ask to be put in the list for the next one. That was my approach.
I think even these days they are interviewing at the event if they like you enough.