Try some of these:

1 coloring the strains by leaving out some instruments the 1st time and adding them the 2nd time

2 reverse the dynamics the 1st time and 2nd time so you feature different instrument colors each time

3 could scale down the numbers of people playing on the softer time thru-example, maybe just 1 on a part and then add all when it's the louder dynamic time thru

Good luck!