I can make any mouthpiece I want (within reason) slot however I want it to. Just because you or anyone else (including players on this site) slot into a random mouthpiece well doesn't mean it's good for them or you. People have little honeymoon weeks all the time before they find out a piece isn't right for them.
The rim on that sucker is pretty sharp and the cup is pretty big too...Either your one of those players that can work it out OR you are one of the poor guys that gets all messed up and confused because there stinkin' teacher thinks they are the Miyagi of trumpet playing. Even the really advanced players on this site can't really help you unless they are looking at your face... if you have the money a good private lesson with a good teacher is really helpful.