Paras crossing over behind the Herc has always been a problem whatever parachute was used. It is the nature of the beast. On sim sticks with a full load of paras in war config it was impossible to maintain a stagger despite what the armchair experts claimed. We tried every which way to do it, to little avail. Once the 'train' started moving it was very difficult to control as the paras only ambition in life was get out of 'that bloody aircraft' !