Wow, surprised there's no other comments on this post.
I have the same instrument, and the same mouthpiece choices - the "came with it" 4C, and a Selmer Concept. And, I had the same issue, until I watched the video below.
You have decent mouthpieces, and the 221 II will play high, but its in the voicing! The 221II has a lot going for it, but suffers a little from the single octave vent. This helps loads.
Watch this video, it explains it all:
I have the same instrument, and the same mouthpiece choices - the "came with it" 4C, and a Selmer Concept. And, I had the same issue, until I watched the video below.
You have decent mouthpieces, and the 221 II will play high, but its in the voicing! The 221II has a lot going for it, but suffers a little from the single octave vent. This helps loads.
Watch this video, it explains it all: