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Rear tire vertical stiffness is probably hurting the 1LE at launch a little even if everything else was the same. Call it one of the non-$ costs of the greater lateral stiffness and better cornering behavior you get from stretching 285/35's out onto 11" wheels.
The 285/35 has shorter sidewalls that are straighter in the lower sidewall region (down near the bead) that won't flex as much as the 275/40's sidewalls that "belly out" more past the wheel in that region.
You could also think that the sidewalls pinching in more with the 275/40's allows them to give a little more over tiny bumps and pavement roughness, upsetting acceleration traction less.
Sorry about all the edits.
Norm
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