I'm with Devil 49.
On a few flights I have had to deal with C of G problems.
Cyclic travel is something you have to give a really good thought and the "cheat sheets" don't take into account your special circumstances.
Your "Go there it'is or Get there it'is" shouldn't discourage you from doing the actual calculations! It pays off at the end of the day.
PA & DA is something to think about in real life, not just for the CPL exam.