Suspension geometry & cornering/handling

[sheekeebut]

This is for all you engineering specialists and track goers.

I've just lowered my sedan on Tein Street Basis coilovers, with what measures out to a 1.5" (38 mm) drop. Last week I checked under the car, and my front lower control arm height measures .70" (20 mm) lower at the inner bushing than at the ball joint. Therefore the arm points slightly upwards.

I know that this lengthens roll couple and lowers roll center, especially if the strut is straight up in terms of lateral angle. At the same time, I'm a little worried about it fudging up my camber movement(?) at spirited road twists.

So the questions:

1) Is the Yaris front strut angled laterally (logically inwards?) in any way? How much?
2) What ride height do you track goers tend to go for your overall cornering performance? Calculated and numerical data gathered for tuning, or just seat of your pants tuning?
3) What does a low or even below-ground roll center "feel" like at corners and bumps?
4) Short of getting adjustable ball joints and steering linkages, do I have to raise the ride height a bit (18 mm if struts straight up?) to get back to a lower-control-arm-to-strut angle of 90° or less to optimize performance? As in, does going over 90° mean having already gone beyond good camber and roll center characteristics?
5) Am I overthinking this?