You mean the Shure olives? I don't think they have very large openings, so they should not effect the treble, in terms of making it more pronounced. In fact, with the narrow Ety sound tube, no tips will have really wide openings, compared to canalphones/dynamics, for example. I am not sure, but when I look at the opening differences between say the Ety foamies and the olives (I have an old pair here), the difference is slight. But I guess it could be enough to cause the highs to be too sharp. Are the sibilant (sssss sound) or just too sharp? There is a difference. I have the HF-2s in right now, with the custom sleeves, the Touch/LOD/amp, and they sound great. My advice to anyone who loves the Ety sound is to go for the custom deal.