UX feedback - color contrast of groups

I've been using "Groups" to, well, group object in order to visually highlight them. But it's always a bit jarring how low the contrast of a group block is. And that's in basically all colors. On top of that the text color also changes to match the background of the group, which also lowers the contrast of text itself. You want more contrast between text and it's background to maintain good readability, not less. Attaching example of a group in gray color, on white background - the worst offender of all the groups :D