I thought that this might be of use to someone. It's a problem I've had with my Chris King and Hope hubs despite only using XT / SLX cassettes. The cassette digs into the carrier making it hard to remove. Yesterday I figured out how to remove them pretty easily which saved lots of hammering and swearing so I wrote it down and videoed it quickly in the hope it would save someone else the hassle.
Hope it helps, sorry if it's already common knowledge and it was just me that had this problem!