[2FastLX]

If you want the lowered look you will have to be willing to sacrifice a little in ride quality. There's really no other way around it. Try adding the Tokico struts and shocks with your Pro-Kit springs and see how that does. The Pro-Kit springs shouldn't be that bad actually. I have a friend with a set and he's running Koni red's which are adjustable, and his car doesn't feel bad at all.

A firmer strut/shock may be the answer you are looking for because lowered springs and factory struts and shocks just don't make for a good combo.

Also...
Have you driven a Bullitt? If not maybe you should to see if that's the ride you are looking for. If it feels comfortable I'd say go for it. I don't think the difference in the cars should be that much to be noticable.

Another thing to look at is are the Pro-Kit springs and the Bullitt springs progressive or specific rate springs? You can probably find this info on the web if you dig deep enough.

Specific rate springs will have a bit harsher ride because they keep the same spring rate throughout the compression of the spring. Progressive rate springs will get progressively firmer as the spring compresses, so initially it will have a smoother ride until pushed to it's limits, where it will act like a more aggressive spring.

To try and compare the springs yourself - specific rate springs will have the coils farther apart than a progressive rate spring, and progressive springs generally have coils at varying distances apart along the length of the coil (see attached image). Larger coil diameters will have a firmer ride, but being specific or progresive will determine the ride "harshness" as well.

Hope this helps.