No really sure why people always try to compare the stingers 3.3TT engine to the Optima's 2.0T engine tuning capabilities and behavior. I keep seeing it every time the subject of tuning the 3.3TT comes up.
They are in now way shape or form similar to one another. Therefore the fact that the 2.0T on the optima runs rich from the factory doesn't necessarily mean that the 3.3TT is tuned the same way. For starters the 3.3 has two more piston, two turbos, hence different heads, larger pistons, I'm sure bigger injectors too, and more piping. All those variables affect how the engine is tuned and its performance.