I am not actually here (sneaking online at Varuna because this week's group doesn't linger over dinner and i am not quite ready fro work) but you might want to consider laisses similaires. The classic example is the Song of Roland where he takes 5 laisses (irregular stanzas? I never really know how to define a laisse) to die, but each laisse has a differnt focus and action overlaps significantly. it is also cool cos it foreshaows in form (by slowing perception of time) the actual sun stopping dead in the sky later on in the poem. I can't think who to refer you to on form and function of laisses similaires except perhaps jean Rychner.