[papajam]

Given the physical dynamics of a tire with negative camber rolling down the road, theoretically it should be toed out. However, doing so does not always produce the intended, or desirable, results. Tire width and road conditions can be factors as well.
For the camber, I agree with 60sRacer. An IR pyrometer to check tread temps so camber and tire pressures can be adjusted to conditions.
Caster at +4 will aid in straight line stability but, combined with wider tires, will make the thing a bear to steer in slow corners. It will also increase steering component wear.
I'd start the toe a couple of millimeters out and adjust from there depending on your particular equipment and conditions.