Pad rolling is a way to find a Grado sound that works even better for you.
With the GH2's, the L pads actually hurt my right ear and I was forced to find an alternative. I tried a few things and Beautiful Audio pads were a perfect match in sound and comfort.
With the Hemps, using the stock pads, the driver is only a few mm's from my ear. I have to drop the volume and some music comes across as harsh. I didn't care for the sound with G-cush pads at all. I bought the Very expensive Dekoni pads and they put the ear too far from the driver and so I have to crank the volume. Not sure about the sound either.
Then I tried the Shipibo's for the third or fourth time and really started to like them. I think they do add a bit of bass, but I like the overall sound and have landed on these as my favourite.
However, I do like Beautiful Audio pads on the Hemps also.
The bottom line is that I have spent Way too much money on Grado pad alternatives.