However, Randy needs to chime in: "It's very easy to get understeer, the car's handling is sometimes inconsistent, and there's something weird happening when I lift off the brake."
What Randy is feeling is a lingering deceleration after he releases the brake (before he's moved his foot to the accelerator)—it's the undepressed accelerator pedal's heavy regenerative braking setting that's confusing him during the transition. Compared to the car's normal "heavy" rate of 0.2 g (matching that of the Jag), Track mode applies a more noticeable 0.3 g's.