Its hard to judge how skins look to other people because monitors have varying contrast levels, brightness levels, etc.
I checked your board again and dark purple doesn't help. Its the clash of colors that isn't working....like I said light/dark primary colors...white text on black, dark blue, dark purple, dark green....things like that. Green on blue, purple on brown, things like that are going to cause problems.
I cannot offer much help on how to change a lot of colors, never using proboards or their system.