First, welcome to CHR! I hope you find what you're looking for here and enjoy a long ride.

From your profile info in the upper right it appears you're building a '27 Roadster Pickup? Your asking questions related to ride and comfort, but the answers are going to affect the stance of your truck more than the ride. Stance is just about the most critical design issue you'll face related to the "wow factor" of the vehicle. I'll offer that my buggy spring front (Pete & Jake's dropped axle, 5 leaf spring w/slider pockets, mounted above the axle) is very stiff but it tracks beautifully and drives great with no bump steer. My rear coil overs are much the same, and I think I will be going to a softer, slightly longer spring on them to try to improve the lumber wagon shock to the spine on bumps at some point in the future. I may also look at removing a middle leaf from the buggy spring at some point, when I've got nothing better to do....