So you're asking us to help you on how to make your cube better, without doing anything physical to it?
If that's the case, then you'll just have to work on your technique of solving the cube. Fingertricks, more accurate turning, eh. Not sure on how to help you on that.
Train on a cube that locks up A LOT, train on this cube for about a month. What this will do is build your turning accuracy. After that switch back you your normal cube.