You can cut springs, oem and lowered ones. Thats ow the pros get that nice lowered look with plus size wheels and tires. In those cases for something that low you need to cut or even remove the bump stops. My tanabe springs set for my insight said to cut all but an inch off the bump stops.
Sometimes lower springs sag. My sidekick has tires 3x larger than oem and hr lowering springs. The rear is saggins and I have to add an inch spacer in the rear to level it out and stop the fenders from hitting the tires on bumps.
Since it looks like you are more interest in performance than mpg, maybe try a forum for your car?