You know what would be perfect? Detour task titles. Match them up into pairs, AND put them in the correct order. The only downside is you'd need one on every leg, and I'm not sure the producers are willing to do that. (And the legs could be planned so the clue for the Detour is given out at the same time as the Fast Forward, so that it doesn't disadvantage those teams.)
Seriously, though, if they want the memory tasks to be challenging, they need to stop allowing teams to make notes during the race. Not letting them use their notes during the challenge is good, but it doesn't mean a thing if they've just spent a fourteen-hour flight studying it all in anticipation for the task. If they don't have the notes to begin with, they can't study them.