Help the bras I recommended aren’t working!

I am shallow, so I tried the Natori Contours and Feathers and neither worked. The closest was the Natori Feathers 32 C, but it was cutting into my armpits. Here are my measurements for reference: Loose Underbust: 31 Snug Underbust: 30 Tight Underbust: 29.5 Standing Bust: 33 Leaning Bust: 34 Lying Bust: 33

Suggested Starting Size: 30C/D in standard US sizing The sister size of 32B/C may be more comfortable