How do I get the B1 sub louder without breaking back into B2 chest? Currently to get a B1 sub I feel like I have to sing a more closed vowel and can’t open up into it as much as the F#1 sub.

And how do I get the F#1 sub sounding less shaky. Like I feel like it kind of floats between like a clean sub and kind of fry like.

Any other tips appreciated!