I don’t know anything about PS Crew except they are from NRW, probably from the area Essen. The acronym PS may mean „POTTSÄUE“, but I’m not sure, if I’m wright or wrong. I don’t have hard facts due to the members of the crew. All I have, is the names of writers which are quoted due to the pieces I found over the time. And here they are, but, as always, no guarantee of completeness and no warranty of any kind!