RE: dual servo's ???
I have no idea waht the stats are for the GWS, I dont know which model of GWS you have.
But for the 805BB, that is a servo that produces 275in-oz, .19sec transit @ 4.8V BUT at 6V, it produces 343in-oz, .14sec transit.
The 805 is plastic gears unfortunately, and there are no metal gear upgrades that I can think of. But using two 805 servos will effectively cut the steering load on the gears in half.