What do ladder bars do ?

Brooks, no crossmember, no coilovers, means no ladder bars. 99% of ladder installations need both. The advantage of a ladder compared to a leaf spring is that the ladder provides axle location and traction angle adjustment, the shocks and coils provide the suspension and control reaction speed.
Now for my opinion. You can reach your goal with the ss springs. It would probably be easier with ladders, but it certainly can be done.
On my car, pinion snubber, adjustable or not, was worse than useless. It added weight, and did nothing. At launch my car lifts in the rear, and the snubber is four inches away from the floor. Tell me what it does waving in space?
Ladder bars can work with leafs, even without sliders. I had a leaf/ladder combo that went 1.36 60 fts.... but I sure don't recommend it.