This is how they look in Solarized Dark
And this is how they look in the regular Dark
As you can see, the parentheses' "highlighted"-ness in the first two images appears to be the same color as the background, giving the appearance of cutting off the row-selector-box, whereas in the third image the parentheses are highlighted in blue. Personally, I think it would look better with a slight highlight that's visible but not too pronounced.
This is how they look in Solarized Dark
And this is how they look in the regular Dark
As you can see, the parentheses' "highlighted"-ness in the first two images appears to be the same color as the background, giving the appearance of cutting off the row-selector-box, whereas in the third image the parentheses are highlighted in blue. Personally, I think it would look better with a slight highlight that's visible but not too pronounced.