Well, assuming you can modify the CSS (Haven't looked too much into Xenforo specifically, but I have a fair amount of HTML/CSS/PHP knowledge), even if you can throw something together quickly, I might be able to send you patches and clean it up real nice. It might even fix it to just adjust some of the colors on the current one, like making the main post text a bit lighter. I mean, even just changing the .messageText font-size to 10.5pt and the .message .messageContent color to rgb(220, 220, 220) makes it easier on the eyes.