1/2 a coil on H&R's make them a bit stiffer, but the eibachs are already stiff, cutting them will make them even stiffer than that, maybe too stiff? 1 coil on eibachs gotta be very high spring rate, very stiff & harsh ride. also you can't just keep going lower & lower, it's not too long before the shock/strut starts to reach the end of it's travel & will bottom, causing them to go bad & ride even worse...