Hey, I had the exact same problem with mine. I tried endless ways to lower my fronts. But, if you look at the side profile of the yaris, the front wheel well is much more rounded (giving it the effect of looking larger). So it's hard to adjust the fronts to be lower. I went through endless work (cutting bump stops, removing the O-ring, tried to cut a coil off the spring) but nothing worked. Mind you I was on 15's so the wheel didn't fill the wheel well but I went through a lot of work!!! What coils you have?

I had the Tein Street Basis coils