i used to have an 05 speed and the aint to much you could do to it tbh. I stuck the full evolve kit on it and the rebuildable ram was well worth it cus it took all the recoil out of the gun and greatly improved gas consumption.
With a 4500 fill i could get bout 1800 rounds out ofit with the evolve kit.
The full evolve kit and rebuildable ram cost me just over £200 i think but worth it.
With the board i would leave it as it is but maybe do as was said above get it flashed at WDP.
could also buy a ultralite for it and change the feed neck but that is about it dude.