I gotta say that this is a very cool topic. Honestly I wish that I am able to do some practice runs in the very low level areas to see just how often the R's and SR's come up in various places in the 6 card selection, but right now I am in the bonus zone. However, I will say this...I have noticed, on many occasions, that specific SR cards tend to show up in the same spots quite a bit.

For example..about the only card I can remember off the top of my head btw...Runa Kamiwano SR card that tends to show up fairly frequently in the event slots tends to show up very often in the bottom left corner.

Now, I don't know if this is simply coincidence, random luck, or if specific SR cards have a habit of showing up in a certain squares more frequently than in the rest of the 'choices', but it would be nice if someone could figure this out.