Does your type of Buddhism teach non attachment to the results of your efforts? I have been reading a lot about that lately. Because you can't control what happens anyway as far as results, only your own efforts.
The good thing is, you aren't exactly hounding the people. I would say try not to get irritated, but still try to reach them intermittently, and also I would say don't hold the expectation of a response in your head. Then you'll be so excited and suprised when they do finally write you back!
Good luck.
