Are they supposed to take OEM K-H pads? Not sure why they cannot haul you down fast... Did you have the original K-H calipers? Did they brake the same?
I guess so but I'm not sure. I had drums on the car originally. I swapped to the KH setup because I was adamantly against moving the wheels out any farther which is what most aftermarket brake kits do. Only after I ordered this stuff did I realize that Wilwood has a 'minimum offset' kit which only moves the wheels out .20". I could have lived with that but I found out too late. It also allowed me to keep the wheels I had on the car so it sort of saved a little money. Not really but you get the idea.
I actually just spoke with SSBC and they suggested using Hawk pads, #D-43. I might give them a shot to see if they work. They also agreed that the brakes should hold the car a little better than they are.
First thing they asked though was how much pressure was at the caliper and that I can't really answer. I have been meaning to check it with one of those pressure gauges that you screw into the bleeder hole. They said there should be a minimum of 1,100 psi. I have a feeling there isn't that much but I need to get the gauge to verify.