Welp, basically, for more uptravel you either need to start trimming the body or get smaller tires... thats about your only options (and Im sure the second one is not an option). For downtravel, I suggest assuring that your shocks are not limiting any droop. If so, get longer shocks. Just make sure you get a good measurment on collapsed length so you dont limit your uptravel.

 

You need longer shocks, longer sway bar links (disconnect front), and longer brake lines to maximize droop. Aftermarket control arms can also increase your articulation. Your up travel is limited by the size of the bump stops.