Speed bumps be damned... leave the front the same and drop the back more.
Just from a cosmetic standpoint I'd drop the back about 1" so the fender arch is "sitting" directly on top of the tire.
Here's a 2-minute photoshop "lowering" for you... I only dropped the back.
Car looks really sweet with that paint & wheel combo by the way. I really want a set of those K18's for my car but now that Lexani has apparently bought out Kinesis I don't know if I can buy from them and still sleep at night...
What mechanical issues/interference will you run into (besides ground clearance) if the car goes any lower? How much bump travel would you have in back if you dropped it another inch? Since you track the car one of my prior concerns of being too low would be to verify you have adequate bump travel in back... sucks hitting the rear outside bump stop in a hard turn and having the back end pitch out on you.