A 5-5 game is most often tournament suicide. Setting up a scenario in which your opponent has the choice of either losing big or taking the 5-5 is not in your interests in most cases. The Minefield game discussed in the cast is a prime example of what not to do, you can't set that objective up in such a manner as to dissuade your opponent from engaging.
If the objective allows you to score points off of it them by all means set the meanest possible trap for your opponent, because either they don't engage and lose or engage on uneven terms.
You can't create that situation in all the objectives though. Sometimes you have to give them an openning.