The only way to play Ace of Spades convincingly is to play it like Lemmy did.
Watch some YouTube videos - he wasn't shy about demonstrating the differences between him and pretty much every other bass player!
In a nutshell - loosen your right wrist, hit it hard and use your left hand to mute unwanted strings, including the thumb over the top technique for muting the E-string which tutors will all tell you not to do.