Saturn with 6" f/5

I looked at Saturn last night with my Orion reflector 6" f/5 reflector, anywhere from 90X to 225X. Judging by the star test I did, the collimation is good, but I was unable to see any detail in the planet, I couldn't even see the cassini division. Maybe my collimation is not as good as I thought, I don't know. The planet was nice and high in the sky, and seeing was pretty good because the image wasn't distorting as if under water or something. Shouldn't I be able to see more detail with this scope?