Hi grendel thanks for your reply.
Could you tell me why you wouldn't go for the DPM system?
Because personally, I think they are a solution looking for a problem. It's not like 9mm has a particularly savage recoil to start with and it's unlikely to have any bearing on a failure to extract other than to make it more likely by slowing the slide down.
Were I you, I would remove the extractor, examine it for any burrs or deformation of the hook, clean the channel thoroughly, then if it was okay, reinstall it with a new extractor spring, preferably the Wolff extra power version.