Back to this for a moment - it depends.
Mainly on your individual mix of highway driving, city/suburban driving, and particularly on how "enthusiastic" your average cornering happens to be. -1.5° is do-able as long as there is at least a fair amount of hard cornering or at least an occasional autocross involved or maybe closer to -1° if it's only occasionally "enthusiastic". Out toward -2° for purely street driving . . . you'd probably have to drive like most every corner is there to challenge you.
In street driving, firming up the suspension can be a mild argument for setting less aggressive camber than you might for the same drivng with all OE parts. But you'd have to avoid driving much harder than you did on the all-OE suspension even though the car probably now feels better about being driven harder.
Norm