This is a similar combination (KW type coilovers with same camber plates) with 170mm springs (so 30mm shorter) but I could go down another 45mm from here. I think my ride height was about 30 to 35mm lower than OEM. These are also slightly stiffer springs. I could slam the car really low.
I'm now using the exact same springs as you but with OEM top mounts. I'm about 20mm lower than OEM and could go another maybe 35mm lower. You should be able to go even lower with the CS camber plates.
- Andrew