三封回复 MIT, Cornell, USC 请问如何跟进

学术套了大概二十来个教授，估计是 CV，Robotics这些领域竞争实在是太激烈了，最终得到的回复只有三个...

MIT 的回复大约是
Thanks for your interest. You experience is very impressive and I will definitely keep an eye on your application. How about us scheduling a meeting when you are in Boston?

USC 的回复

Thanks for your interest in my lab (and yes I remember you!)
In fact, I plan to take a few PhD students every year, and your background seems very well matched to my lab. For admission, please apply directly to the department, and indicate that you are interested in my lab when you submit your application to USC. Then, I will definitely take a look at your application.

If you are not in rush, how about us scheduling a meeting late December or early next year?

Cornell 的回复

Thanks for your interest and your experience looks good. Please do apply to the program and mention me in your application.

希望过来人帮忙分析一下
1. 这些回复中分别是几分客套几分认真？
2. 现在有一些论文的构想，现阶段是否适合跟教授直接讨论？ （如果申不到心仪的学校，想争取去他们那边做一个 RA，gap 一年明年再申）