[T77911S]

you start playing with something like ride height and it turns into a domino effect.
the suspension is designed to ADD neg camber as it moves up, to a point. so if you lower it, without making any changes you are adding neg camber. now as said, lateral forces are higher due to lower CG so the suspension wants to compress even more. problem is you have eliminated the suspensions design of adding neg camber as it moves up so now you have to add springs and sway bars to reduce the suspension movement.
now if there is any suspension movement left you have to add even more neg camber because if the suspension moves up it is now adding pos camber.

take at look at your lower control arm. as designed it should angle down. that way as the wheel moves up it adds neg camber.
if the arm is parallel to the ground and it moves up it will add pos camber.

as you go lower you start to hit the limit on how much camber can be added.

I would probably goto euro ride height and start with goths setup. start conservative and make changes as needed. if you have understeer try adding some neg camber.
take it to a skid pad and get some video of how the outside wheels look at max traction.

what works for one car does not mean it will work for another and as you see hear you already have a variety of settings.

I had a friend that had an MR2 that he autoXd and did some track time with. everyone always told him he needs to lower his car. it actually sat quite hi. he would just na, that's ok, I m good.
he new about the need for suspension travel and its effects.
he was always 1 or 2 at the autoX and even set an unofficial track record for his class at a local track.

trust me, I enjoy the heck out of my 930 with stock settings. I could change the settings but on the street I would never know.
and yes, camber will wear out tires faster. even with stock settings my inside rears are more worn than the rest of the tire and on my last 911 I had lots of camber on the rear and it wore out a set of tires long before the rest of the tire was worn, and I had it aligned.
other thing is I am running pretty wide tires. 285's I think. narrow tires the effect is less.