Thanks for taking the time to play the game. :)
The stacking mechanic is for the narrower platforms as the cats won't be as spread out and the speed is reduced, making it easier to navigate through those areas. The moving platforms require more speed, so it is best to unstack all of them for maximum cat speed. Another strategy would be to deposit some cats first while taking a smaller, faster group of cats for the more dangerous exploration.
I hope you managed 50/50 next time. Cheers!