the flex doesnt look too bad on your truck... like WT said, you want your bumps to limit your travel just before the springs go neg-arch. Sure you could technically squeeze out a few more inches of flex but its not worth flattening out a nice pair of springs and bottoming your shocks to do it.
I say leave your setup like you have it... i think that as the springs soften up you can still gain some flex via droop, and not worry about how much your tires stuff into the wheelwheels...
