This is one of those deals where you just aren't going to have a lot of options & there simply *aren't* any cheap/easy fixes. If you want more "flex" and by that I assumue you're looking for more axle articulation or travel. You can go to a 6" lift and that will give you more suspension travel. You can keep the existing height and switch to a spring with a lower springrate, it won't be as stiff and it will allow for more travel but you'll need stronger shocks to control the bounce & rebound. With a setup like that you may find yourself looking into bumpstops & limiting straps to keep the tires from hitting the upper wheelwell and also from dropping too far down when in the air or unsupported. Regardless of what route you choose there really isn't anything you can do that won't involve replacing the springs. I didn't think to ask earlier but if you're running the stock front & rear swaybars you'll need to either get the quick-disconnect droplinks or remove them completely. I know a lot of guys just pull them off & report no difference in handling but that's what you'd expect to see in aproperly setup truck. The swaybars don't do a lot until the suspension starts to max out, and of course that's when you need them most. Having seen & investigated a lot of accidents I'm a big fan of keeping stuff like that on the truck when it's driven on the road, the swaybars come into play when you & your suspension need them most. Off-road is a whole different story and I understand the need to disconnect them and that's why the quick-disconnects are available in the first place