you can't prevent the pad from wobbling back and forth and wearing unevenly. we call that "canoeing". If the pads have absolutely no play, your brakes do not get the same amount of bite, and will not work as well. The vibration of the pads is what gives you the nice sound.
你無法防止煞車皮因為前後晃動而造成的不規則面，我們稱這種限象叫"Canoeing"。如果你煞車皮都完全不會晃動的話，你的煞車皮也無法得到相同的緊度。那種振動就是我們平常聽到煞車時美妙的聲響。

In terms of brake pads that have a lot of power, I have tried more than 30 different kinds of brake pads i think, including every single color of the koxx bloxx, the vis pads, the coustellier pads, and the different monty ones. I would personally recommend either the TNN LGM pads, or what i'm running now, which are the Rockpad blue with CNC backing. Both have great bite and hold. . The TNN pads require a sharper grind, but offer a better lever feel. Frank has the LGM pads on his bike, and i heard he is pretty happy with them.
為了更強緊度的煞車，我想我有嘗試超過30種以上的煞車皮，包含了所有koxx推出的不同顏色之煞皮，像是Coustellier pads，和不同的MOnty使用的。以我個人的建議，不論是TNN或LGM或是我現在用的pads是rockpad 藍色的加上CNC底座。這幾種都有非常好的抓力和咬力。TNN須要磨得較粗糙的輪框，但是提供了很好的手感。法蘭克就用了LGM的煞皮在他的車上，我聽他一直在跟我說他用那煞皮用的好爽好棒。

Some other good tips on making your hs-33 work better :
還有一些小技巧可以讓你的hs33表現得更好：

1. Do not take your wheel out of the frame, or take your tire off of the rim when you grind your wheel. If your braking surface touches your tire or tube, it will be contaminated
1. 磨框時不要把輪子拆下來，或是把外胎拆下來。否則那些東西在拆裝時很容易汙染你的輪框煞車表面。

2. Do not rub your tire against your brake pads. If you need to take your wheel out to change a flat, take off your brake pads first. Again, the tire can contaminate your brake pad.
2. 不要讓你外胎碰到煞車皮。如果你要拆下你的輪子補胎之類的，先把煞車塊拆下來優先。同樣的，不這樣做很容易汙染煞車塊。

3. Once in a while, clean your brake pad with some dish washing detergent and scotch brite pads. Make sure the detergent does not have any hand moisturizing agents.
3. 偶爾，用那種洗碗精跟那種蔡刮布來清洗煞車皮。但要，洗完後千萬不要用手碰觸，否則又會再度污染。

In case no one knows what a scotch brite pad is, here is a picture :