I had to swtich away from that theme for precisely the same reason.
Then I decided to hack Maia-dark a little bit: Go to Settings / Colors,
select maia dark,
Then click Edit Scheme.
Then select the Colors tab.
Scroll to the element you want to change, (I chose inactive title)
Then click the Color Swatch to change it. (I just added a small amount of green tint)
Then Save-AS, and give a new name - I used Maia-dark-hacked.
Don't forget to select and apply the new name as you exit back out the way you came.
Expect a couple trials till you are happy.