you may be missenterpeting what is happening. if you start with the gun very much out of level it will take some twisting to get with in the bubbles working range.. it is a very short low arc.. when it comes to the level position if your still turning it radically with will flip to the other side.. look over the gun and get it level, or use the rear sight standard to make it verticle then move it slowly from there.... the other things that would vary bubble speed is the arc of the level glass or the medium that the bubble is in.. i wouldnt think oil would be slow as in a small bottle the bubble will still move relatively fast.. it could have too large of radius but the good part about that is it would be more accurate.. give it time,, if it still bugs you after a couple months youl probably need a different brand.. dave..