I'm using a Thrustmaster T300RS wheel and T3PA pedals. Despite having calibrated them I get a small but constant on throttle without touching the pedals.
Same with Fanatec CSW V2.5 Base and Fanatec CSL Pedals. Gas way too much sensibility, very short travel way and its like constantly on throttle without touching pedals.
Setup a deadzone for throttle. Change a sensibility if you feel like full throttle is too early too. Same like above. You can change sensibility also.