Sounds good, reach out when you can. I also did get in a sync-strip unit, which also works when running to my OSSC. But again with the same "S" curve at the top and being a bit off center. I saw the same going through a RGB to component adapter before going into the OSSC.

~90% sure that's just how these systems are... not found a solution. Could also be that mine has a problem I've not been able to find information on. Not everything likes the HDMI signal that I'm getting out of the OSSC at this point. My capture box refused to acknowledge it.
Edit: After some poking around and work in other threads, the following two settings in the OSSC output correctly adjust for the curve at the top of the screen.
H-PLL pre-coast: 4
H-PLL post-coast: 4


Still a bit off center, but I'll work on that when I have the time. For now the bubbles must be bobbled and the elevators actioned.
Edit 2 (electric boogaloo): Looks like there is a H.Backporch setting in the OSSC to adjust the off center output. Will work on trying that today.