Ok so I’ve updated the firmware and first impressions are very good. I have the OSSC running into the Denon on 480i passthru and the picture is no longer a complete mess. It seems to be a normal 480i picture and when I switch the Denon to Game mode I no longer get the weird color distortion. I will continue playing some different games and consoles to see if there is any other abnormalities but as of right now I am very happy with what I am seeing.
Gara I recommend that you try out the firmware for yourself and see if it fixes your problems as well.
A huge thank you to marqs for the all the help and support. The OSSC is an amazing invention and I am super happy to be able to put it back into my setup.