I don't think slammage is really for function, it really doesn't make the car do anything better (drag coefficient...no

). Better handling results from lowering the car on stiffer suspension, but not slamming it.
Better handling actually comes from more effective use of the tires, which is fairly complicated.
First you need to minimize weight transfer, to do this you need to get the Roll Center as close to the Center of Gravity as possible. Lowering a car lowers the CG, and also moves the RC. Where it moves depends on the car. One of these days I'll figure out where the RC is on an Accord.
Second you need to optimize the alignment, get as much of the tire on the ground as possible. Generally about -1* works because in a corner the body rolls on the suspension and the tires. The body roll is compensated because the camber moves more - as the suspension compresses, but not when the tire does. If your static camber were 0*, you would have + camber in a corner.
Third you need to have as SOFT of suspension as possible. It needs to only be stiff enough to keep the suspension off the bump stops, any stiffer and you loose tire contact over rough surfaces. The dampening needs to be matched to the spring, too stiff and you start jacking, the suspension does not have time to recenter between bumps/dips and it gets 'stuck' up or down. Too soft and it's bouncy.
If I had to guess the optimal lowering for handling on an Accord is somewhere between a 1 & 2" drop on non-progressive springs. I say non-progressive because that's my one complaint about the H&R race springs that I have. Entering a corner is tricky because the car is unstable until I compress the soft 'ride' coils and get onto the stiff 'race' coils. So even if the static alignment is good, by the it's compressed I'm sure it's way out of whack based on the way it overworks the outside front tire. My fix has been 215's on the front and 205's on the back, cause I like the way it rides, and I like the look.
Well, the back could be lower, but I pull a trailer and go camping and stuff. Any lower and it will rub when loaded. I should try and make some caddy/lincoln air struts fit.