Okay, well I only mention this for the sake of the developers of PS3MediaServer.
Using Tversity 1.0 RC7 and this playback guide Method A (http://forums.tversity.com/viewtopic.php?f=28&t=8063
I was able to get fonts to render on Maria Holic in the correct style and size.
Also, the fonts on Hyakko rendered in the correct size.
Sadly the quality and functionality of Tversity is not as good as PS3MediaServer, but I guess switching back and forth is a reasonable solution to my problem right now.
But if taking a look at that playback method can give you developers any clues, hope it helps.