Some of the PR stunts are pretty easy or hard to beat, depending on your car, the weather, the environment, or the road. sometimes it can be strict or medium on current circumstances, a setting to manage Stringency on PR Stunts will help you beat the stunts or climb the leaderboard.
Speed traps: guaranteed reach of target
Speed zones: accurate detection of speed, barrier of zone, guaranteed reach of target (must turn off all other settings)
Danger signs: multiplier of length, arc of the jump, assisted landing, guaranteed reach of target (must turn off other settings)
Drift zones: score multiplier, barrier of zone, guaranteed reach of target (must turn off other settings)
Trailblazers: timer speed, guaranteed reach of target (must turn off other settings)