Watch the Melody: Mixed Mode online guitar lesson by Matthieu Brandt from Songwriting on Guitar

When you incorporate mixed mode chords as part of your harmonic progression, you can chose to underline it with the melody or soften the somewhat raw and edgy sound these chords create.
By targeting chord tones that are unique to the mixed mode chords bIII, bVI and bVII you'll stress the edgyness of the progression. By avoiding these unique tones and targeting common tones, you'll smoothen the edgy feel.