If anyone here wants to get into ovals, but doesnt like the NASCAR side of things you should consider the IndyCar. Last season in the Dallara. I wrote some setup guides that can help you get up to pace. My first one explains things that will work at all 1.5mi or longer tracks.
Mosport is Canadian. But, I still don't understand your point about multiple lines. Every corner there has 1 fastest line. And Watkins Glen has only 1 corner with a variable line, but most people tend to either take a later apex or hug the bottom in the loop.