[Blas]

I don't think the RT bar projects any lower then the standard sway bar does below the car. The sway bar's position (relative to the ground) is set by the two poly mount rotating clips connecting it to the chassis and that is pretty much sets it for you. (The laws of physics says that two objects - bar & chassis -cannot occupy the same space at the same time)
Ideal setup I am told is sway bar and its arms parallel to cars A-arms and the linkages perpendicular to A-arms and sway bar. Never seen one meeting both parameters because you can tune the bar by adjusting the linkages connection point on the sway bars arms closer or farther from the bend to change the leverage.
You should eliminate the preload on the sway bar by making the final adjustments to the drop links with someone approximately the same mass as the owner sitting in the drivers seat. Don't think fuel load enters into the equation because the fuel tank is pretty much centered in the chassis and the fuel sloshes around some.
Blas