Look at a lambo, and do the exact opposite
Those things are freakin horrible. Honestly it's a lot of personal preference and ergonomics. I don't like a lot of brake pedal travel at all so tend to set it a little lower, so under a hard stop I can bump the throttle about 1/4-1/2 open very easily.
Are you using a nice adjustable setup or is this a once it's done thats its configuration?