Try to get someone outside the parks to help you. I got a low boarding group for a friend at
disneyland last week. He told me his app took longer than expected and got kinda stuck for both of the phones he was trying (him and his wife). He practiced from home too, but being in a crowded place can make a difference. So, if you think you can have someone with a good wifi connection at home, it would really help with your chances.
Also, I will be there in a couple of weeks and if I don´t get one I will cry too and I'm over 30 hahahaha

, so I get the frustation.