Those are great shocks, they are just firm and you actually want soft. Not OEM soft but performance soft. The first thing I do when on a trail is lower my air pressure in my tires, because firm is no good over rocks, not in tires or shocks. Firm is great for the street, but like I said just about everything you do performance wise is a double edge sword, you give up something to get something. However, OEM shocks are usually so bad that a firm shock will seam like an improvement for people who haven't run many brands of shock. I have ran several brands of shock, and BILSTEIN's are gut bsuters. They are built like a brick chithouse and will last the trucks life, but you will regret the choice on tough trails.
BILSTEIN's and Rancho's have very little rebound, when you go down into a ditch it feels like you stay in the ditch, but the kyb's will pop you out of the ditch. I don't like the KYB's either, but imo they are easily best of those 3. Adjustable is the way to go, or even a Monroe shock is a good choice. Just one man's opinion here, but I have ran all of the above and more. Adjustable will let you go from street to creek and perform exactly like you want in both. Some brands even let you adjust from the Cab, pretty cool if you ask me. They cost a lot more, but it is way way worth it. Those firm shocks have ruined many pleasant rides for me.