Welcome to GTP 👍
Just as some advice for the future, you will drive so much better with all driving aids turned off. This gives you full control of the car all the time, which might seem hard with a high-power low-grip car like this one, but when you get used to modulating the throttle input you will never want to go back to having traction control. Even just now, you noticed that TCS does slow acceleration, particularly at start-offs - the computer steals the engine's power.
By the way, a steering wheel isn't needed at all for throttle control - I use a standard DualShock 2 (DS2) controller and find it easy to have exactly the right amount of throttle at the right time - it just takes practice. The X button isn't an on/off button, far from it
And manual is the only way to go
DE