CS,
I think this is something that will be hard to diagnose on the forum. It could be something a simple as a slow button, needing stiff wall slicks, etc.... Or you could be needing a fourlink change. Some things to look at are, tying down your front end, check for slack in your suspension, do not use a relay for controlling the trans brake solenoid if you are, look at the length of movement on your button, try putting some weight to pop the front tires up out of the beams or four link change whichever, shorter front tires. See where I am going with this, there are many, many variables and they are all different on each chassis. Are you needing to pick up a couple of hundreths or six or?
Curtis