My opinion is that clamps with bars would be counterproductive. Generally one one lowers spring rate on a drag race vehicle provided axle wrap isn't an issue, the one exception would be if you trying to gain traction on the front end.
Run the bars without the calmps it is a better ride. You don't need the calmps if you are running bars. If you run them together and decide to take the clamps off the bars will need to be readjusted.
ive ran them for like 3 years now. they did good until i got to 1000hp and they bent the front brackets down on the frame. i had then reinforced and havent had a problem since