Disc brakes still not stopping good

Got a good hard pedal but the car just does not stop good. Just kind of lazily comes to a stop with hard push on the pedal..

does the car have good initial bite, or does it feel almost like you are sliding when you press the pedal, like the brakes are wet, but then they come in more when you push harder?
in an attempt to lock the brakes up, when you stab the pedal, does the nose dive, or does the car come to an even, controlled stop, just not as soon as you'd like?

also, what PN SSBC kit is it? I ask because your issue may simply be the brake pads. Everything may be functioning 100% correctly, but you are just not getting the performance you want, under the conditions you are driving the car. A legit high performance racing or competition brake pad is going to perform very poorly in a daily driver, just like standard pads will perform poorly for racing. A standard pad is designed to give great initial bite and braking from fully cold through warm, conditions a daily driver sees, but get them hot through REALLY HOT, they can fade completely out. High performance pads will have that same vague "brake fade" feeling fully cold through warm, but will have great bite and braking hot through REALLY HOT. There are pads on the market that are great mid-range warm/hot performers, think street/strip pads. Looking at the SSBC kits online, I don't see much info on the brake pad material. If you are unsure of what kit you have, or what pads your calipers are loaded with, that is what I suggest trying next. Load a set of "basic" pads and see if they offer the performance you are looking for..

**edit- reading through the SSBC website, I am VERY surprised to read this in their tech section:

How should I bed in my new brak pads and rotors?
WITH EVERY NEW SET OF ROTORS AND PADS, YOU SHOULD GIVE YOUR VEHICLE 200 - 250 MILES OF EASY DRIVING TO PROPERLY SEAT THE PADS TO THE ROTORS. DO NOT TAKE THE VEHICLE UP TO 60 MPH AND JAM ON THE BRAKES BEFORE THE FIRST 200 - 250 MILE BREAK IN PERIOD IS OVER, OR YOU WILL GLAZE THE PADS AND ROTORS

this is the complete opposite of my personal experience with disc brake systems from standard equip to high performance, fixed to floating rotors. I guess it's like engine break-in. Some believe you need to baby it, keep the rpms low and build up to normal driving, others believe a "hard" brake-in is best..