Look through the lock holes of the FastGuns - You should see about half the hole covered before you feel the spring tension on the mechanism.
Make sure your air bags are plumbed on separate circuits. If the connections are teed together, the high CG of a TC will push the air pressure left to right causing sway. This is not an issue with a FW since the weight is centered at the pin.
If you are airing your bags up so the overload springs are not engaging, it will give you a bouncy ride. This is the reason I use the taller bump stops (upper StableLoads) on the top of upper overload spring and wedge (lower StableLoads) on top of the lower overload spring - The springs will engage sooner and less of the weight is supported by the air bag.
I did not find heavier dampening shocks to help sway as much as porpoising and bounce. To cure sway, you need to load up the springs more or get a heavier sway bar.
