BM sample paint not covering well
I just got a few BM 2 oz paint samples and found that the paint (cream color) really does not cover my white walls very well. I also remember that I wasn't terribly impressed with BM paint a couple of years ago and had a BM color matched in SW Duration --- which covered very well and has held up very well; it's also scrubbable without changing the color. More recently I used BM Aura and it seemed fine, but I haven't scrubbed it yet.
What kind of paint is the BM sample? Will I have the same problems with coverage with BM Aura in the cream color? Should I switch to SW?