Looks like you definitely have a challenging setup there. Can't tell positively from the photos, but it appears the three setting will net very little change in the torsional torque applied. With the arms turned outward, and nearly parallel with the centerline of the bar, the adjusting holes may no longer translate to a reduced radius of the arm.
Have you considered a longer bar that sits instead above and behind the suspension, on top of the tub box, where you can improve the arm geometry? I know you've already invested a lot of work in this, but it may give you a more effective setup to tune the car with. They are 37.5" long, which would allow a couple more inches, and would allow the mounting points to be close to the vertical walls of the box (strength). Just some thoughts. I used the splined NASCAR bars on my project (hollow ones) and love the adjustability, but you'll need the arm configuration to take full advantage of that.