This is my issue:
The current coloration makes the menu titles & forum categories nearly impossible to read. I've been trying to figure out how to change it to #333333 but haven't been able to find a way to yet. Will this require some CSS? Thanks in advance!
You made wrong configuration of colors. Please navigate to the Forums > Settings > Styles Tab, and fix the #3, #5 colors, make those dark black
Then fix the #12 color (Primary color), make that dark blue or some other dark color, something closer to your website theme primary color. Make sure you use the Dark style.
Also please leave a screenshot of your color configuration if you got further issues.
I'm sorry but this will bring tons of color conflicts. All your texts and links should be either light or dark. I already see the forum titles and all other links are light and if you try to customize category (parent forum titles) links to dark it'll require lots of custom codding. The best solution is keeping the menu bar and the category panel background dark, to make all links light.