I am trying angling my bow slightly so that the A string has a contact point closer to the bridge than the D string. And also accenting slightly when I have just made a shift (particularly when shifting up to an A on the A string, which otherwise gets completely overshadowed).
But none of this does that much good, because the open D has loads of time to develop very strong resonance and therefore has very strong tone, while quavers on the A string do not develop the same resonance (even if I'm playing them in a way that I'd be very happy with if it was just the A string sounding...)
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