[Fit Check] New and wanting advice and suggestions on correct sizing and bra styles!

Hi everyone!

I am new to the forum and just measured myself yesterday. Here are my measurements:

Snug underbust: 30" Tight underbust: 27" Standing bust: 34" Leaning bust: 35.5" Lying bust: 33.25"

I plugged these numbers into the calculator and it came out with 28E/F, with sister sizes being 26F/FF and 30DD/E. However, when I calculate manually using the written guidelines my size comes out to 30DD/E.

From what I can tell reading the articles on breast shape, I have wider set shallow breasts. This explains why it is always so hard for me to find something that fits! The whole simultaneously too big/too small problem is my life.

Any advice on what sizes I should actually try/styles that I should try? I am in the US if that makes any difference. Thanks everyone!