Although it was not always so, I plan every single RTQE program in advance. In part, this is because I'm programming from my personal library quite a lot of the time. In addition, I honestly try to make sure that things fit together with something that (at least at the time) seems like it has a logic, and the logic of free association is such that your request might not fit well, even if I did know it was in the station library.
So don't feel bad. I try to pay attention to requests and selections, and it's quite likely they'll show up the next week or thereafter."