My typical setup is a Pilot on 7D as well, one of the best things I did was add a battery grip on the rig, it doubled up the batteries (only option I could afford at the time) but also made quite the difference in weight distribution. Since this raises the lens height I also added a cage to top mount the matte box and this gave me enough weight to give a much better feel. I belive (and have been taught) to always look for practical weight additions first, but in the end do what you have to for a heftier weight on there. Adding some behind the camera weight will make a world of differece as well.