It looks like the questions you've asked lie in the overlap between SO and PSE. Both sites could answer them, but they would give different kinds of answers, and since SO is bigger its answers will show up faster.
In my opinion, the three questions you've linked are all slightly more appropriate for SO, because they cannot be generalized to apply to ...
In addition to the excellent answer by @lxrec, Programmers is so much smaller than StackOverflow that you just have to have a bit more patience.
It is not uncommon to only receive answers after several hours or even a day, where questions on SO get answers within seconds.