most shocks will only have 4 1/2 to 5 in of travel. pumpkin hitting the floor is common. especially with a 9 in or 10 bolt. just the price we pay to set low . shock angle should be 15 to 30 degrees. shocks mounted straight up are pretty much useless. if your springs are loaded and fairly straight you might try a heavy first leaf ( short one ). it will limit spring travel.