Interesting logic there....
I have a transplanted V8, dual batteries, compressor, aftermarket bumper, winch and a bunch of other non-OEM farkle on top of my front axle, sprung by 600 pound Eibach's and it still keeps the rubber on the ground and can be described as harsh at times.
But you got "rake" (you make it sound like genital warts) that you need to get rid of. So your solution is to put on 700 pound springs?
What happens to the rake after you load up the truck? It goes away. What happens to the truck when you load it up and you have 700 pound front springs? It looks it's squatting in the rear.
I can never have quite understood why there is such a need by Americans to "level" their truck. It does nothing for their truck but offer some sort of visual appeal. It has nothing to do with performance by taking the bias off the front axle where the dynamic forces of steering and the majority of braking occurs and decreases the efficiency of front axle suspensions.
My 2 cents...