Depending on how many games you have put on the ball it may just be at the end of it's life. The reason bowling balls have such strong reactions out of the box these days is mainly because of how "sharp" the materials used for the coverstock are. Think of it like a jagged blade of a knife. Well the knife gets dull, and even though you may sharpen it, it still just isn't quite as sharp as it originally was.
That being said, what you could try is going with 500 then straight to 4000 without using the 1000 or 2000, or maybe even 360 to 2000.