what is the specific problem you are having?
to start from the beginning, do the pen/pencil test. set up your camera like you would for a follow cam (cap off, card in, zoomed all the way out etc.), the try to balance it over a pen (facing the direction of the lens). Do this, then turn the pen 90* and try to balance it again. Where these two lines intersect is the center of gravity of your setup. Mark this with something, then find the center mounting hole on your mounting plate (if you use a quick release, you should do the above steps with the top and bottom attached). You want the mark you made to be visible in the center hole. If you need to fine tune it a little, try adding a small washer or something to perfect it.
Now comes to counter-balancing. Start out with one weight on each side and the column all the way in. With your camera mounted, raise it to 90* (lens pointed straight down), and let it fall. if it is too slow, then extend the column. if it is still too slow, push it back in and add more weight. Opposite for if it is too fast. that should get you pretty close to perfect, balancing my first time was hard, but with the hd I can go from in the box and unassembled to ready to shoot in 15 or less with any lens. Also as a tip, i found it helpful to put my handle in a clamp for doing the drop tests, just makes it a little easier. hope this helps