I have a heavy shoulder rig (red clutch, dragon, cooke 25-250 zoom lens, focus, lights, mic, battery, etc) that is super front happy. The only thing behind the red is the battery. I am guessing it already weighs a good 30-40 pounds. Would adding a counter weight in the back make things more comfortable? I am thinking I would have to add a good 10-20 lbs to even it out but I guess it could be less depending on how far back it goes. Also, any recommendations for a counter weight?