Am, perhaps you could upload a pic of your car with the rear wheel camber as an example of large negative camber.
Ok well on 17s, this was lowered don't know how much... maybe 80-90mm?
That was around -3deg all round..
On the 19s, before i went agressive on the spacing..
Rears, shaved in those pics, front hardly touched, other than the tyre just rubbing the inserts and making room
Now i have shaved rears, and Rolled and flared, same at the front. Rears are pushed out 12mm more from the above pics, and fronts 8mm.
Cam on 19s is -2.5-3deg front, -3-3.5deg rear.
Sure it looks good, but you will go through tyres in no time, like 4000miles tops! :o