Tight Corners

I'm starting long tones with tight corners during the rests. I really crapped out at Bb. This is going to be a challenge. Again, see:

I tried the Wick 4x and it's really sensitive. It's so easy to overblow. If I ever do get the hang of it I will be able to "peel paint off the back wall." I switched back to the 1.25 c. The tone out of the box is so much nicer.