I still haven't learned what kind of ensemble you play in, age range, playing level etc.
Because unless you are playing at a serious college level or better there is no need to play such a huge mouthpiece. And even then you could still get away with something easier to blow.
After you OWN a High C, like all night long, never get too tired to play it and at any volume loud or soft? OK then consider some kind of switch to the larger pieces just to get the characteristic symphonic tone. But not before then.