Memorized 12 and 8 step figures will not function. You have two ways to approach improvisation. Learn to split the figure into a different ending when you realize your first idea is leading to trouble (this requires higher level tango skills). An easier strategy is to utilize 4 and 2 count figures (elements). The rock-step is a good defense against a potential collision. Drop all the hot moves you just learned in class, but haven't quite mastered. Learn to do very tight circular moves.