Jay I've been on a bilstein training course and that's where I first learned about differences ect,,, they don't recommend there coilovers for road use unless you are aware they are not comfortable on the road,,, pot holed London roads they laughed at the idea as they not linear spring would work on a pot hole

Valving the shocks and rates is great but R&D do this already when making kits for the better suited for application which is why BOM, FK ect work fine on road but suck on track,,, oh and I'm sure the cheeper coilovers are the same kits restickered hence they look almost identical and have rear platforms identical for rear height

I'd personally rather a B10 kit that cheep coilovers as I prefer twin tube handling after 5 mins on use not to aerate the oil like a aero bar