[Dean]

Ah, 225 18s at relatively high pressures... What tires?

I don't see that you said if those alignment numbers were before or after you put on the coilovers and set them at that height? Those camber numbers are fairly positive even for a stock Impreza.

Do you still have your stockers? If so, put them on and tell us how it feels at OEM tire pressures on the same road.

By changing to 18s, you have added probably 100+ pounds of basically undamped spring rate to your suspension. (Austin, help me out here...)

That is tolerable on stock struts, but as almost everyone who has tried 18s on Imprezas has found, it is not fun, especially on coilovers with limited adjustability. 17s appear to be about as far as most go for the street.

Also, as I mentioned, you are in negative camber land at your ride height due to the Imprezas suspension geometry. Any amount of lateral load is going to quickly take your outside front to zero and then quickly positive. So, while not directly related to bounciness, If you want the car to handle remotely well, you will need to raise that ride height at some point

Depending on the road, you may even be running out of damper throw at that ride height. At rest, how much damper piston shaft is visible? Did you happen to see how much was visible at full compression of the damper before you installed it?