Jchiller, that's a great display of function strength and endurance. I can only imagine the effort that went into it to get to that level.
Building muscle while staying lean is the dream of anyone that is weight training. In your application, maybe consider adopting the training techniques of a sprinter; a mix of low and high rep squats, deadlifts and benchpress, coupled with field sprints and the bar work you are already doing. But you will need to up your calories to sustain and grow from the extra workload if you want to see results.
Good luck and be sure to keep us posted on your results.