I have the bp51s and backed off the preload to 10mm since I don't have any front accessories. This netted me 2.5 inches of lift on the front. I've only added sliders (~120 lbs central weight). My rear was way high with the medium duty springs that came with OME. The rear is also way high with the RCC 2.0 super flex coils. I'm going to swap in for some Dobinsons rear coils which are supposed to be 1-1.5" of lift. I'm hoping to level the truck and get the rear axle in a more neutral position.
I would caution folks without built up rigs getting BP51s. At slow speeds, the compression feels stiff. It gets nice at highway speeds. Though, even mobbing the desert (pretty sure I left the ground...) I don't think I used all of my rear travel with the compression set to 0.
The kit was designed around a built up truck with about +300lbs up front and +150 pounds in back. I like the adjustability, but I might need to get them revalved for my weights. Coming from the backpacking world, even when I'm car camping, I don't have much gear. PM me if you have questions. I don't post much.