I have one problem in my group and it is a singular character who has min maxed the entire use of XP in order to maximise the pool that she rolls on pretty much every important check she makes (intellect based character) that no matter what I do...I cannot challenge the character at all.
YYYYGG is the dice pool I am up against most and tonight she got 3 triumphs on one roll. It's getting to the stage where I can't potentially make anything bad happen related to computers or mechanics because success us gaurenteed 99% of the time.
However if I dare increase the difficulty to a Formidable, Daunting or Impossible check. I get an earful about its unfair and in any way not possible.