The Steeda Ultralite springs lower the car but keep the car nearly the same for stiffness. Just a thought.
And yes after any install give it a week to settle. It will lower a little more by end of week.
Also this is why if you don't use coilovers at least get an adjustable spring perch so you can tailor the ride height to your liking. Springs are easy but it's what you get is what you get, no adjustments. The adj. perch out back can help though. Since the rear is what generally requires the most amount of tinkering to get it just right.