If your stream is at the max setting that's comfortable and you move around a bit and make sure to get the whole area I've got nothing for you other than a recommendation to up the fiber in your diet.

I did get a nicer one that can just about peel the skin off on the highest setting, but even the lower quality one I have on the main bathroom downstairs gets me completely clean. I do tend to use it longer than 30 seconds, I'm pretty thorough about the rinse process.