Sleek is one of an uncompleted duo planned by Rubbinio; thus the "light blue" name as he had a test version of a "dark blue" skin he never published... that and another skin he said he had mostly finished but I never even saw a screenshot of
So, if anyone did want to work on a skin I'd gladly test it for them and give them ideas/notes like the five or six pages I gave Rubbinio for Light Blue that helped him give it the detail and polish it has.
As for your question though the only way to change that text coloring is to change the color of all the default white text in the game; so that would mean the letters of the menus, sidebar, team names and scores on the schedule page etc. A lot of the .col options make changes in multiple locations... That's why my design considerations/testing have always taken that into account...
Really the only thing you could do in this case would be to alter the titlepanels adding a darkening overlay "shade" that would overlay the area with a darker color resulting in more contrast... I'm not sure how it would carry over on non-white titlepanel sections though. The problem comes from that text is usually on top of the side solid portion of the titlepanel. As it's a "design decision" it could only be changed by redesign or a swapping out to a different titlebar...
...but is it possible to edit the colour of the date when there is a white background (see Screenshot-click a couple of times to zoom in on the date), as it is currently hard to see...
. Only about another hundred leagues to do now...