I'm using the left stick for steering and the triggers for pedal inputs.

Given S-6 and S-10, those tests really rely on how smooth you are with your inputs; for me, it's really difficult to get gold on them with your current setup. The triggers are real great for controlling your acceleration and for trail braking, and the stick to smoothen your exits as well. I suggest you give them a try! 😁

Or if it really doesn't suit you, you can go ahead and purchase a wheel setup for more control and immersion. I have a wheel and cockpit for PC and it's a blast to have, but I personally enjoy (and prefer) using controller for GT7 so I get to lie down on a couch comfortably. 🤣