Hi Keilmillerjr-
Yeah, the GBS 8100 converts to 480i so the games run in interlaced mode without scanlines. So, if you want scanlines they need to be generated some how.
But, I actually bumped up the resolution to 800x600. It's really more about timing with a crt anyway.
This was a quick solution that works well but a better solution might be using a J-pac as the raspberry pi supports 240p. So, I could have spent a little more money and just bypassed using the GBS-8100 altogether.