camerakev

I fly video for a 4 way team and an 8 way team so all belly, the occasional tandem video I order the ND filter, paid extra to get it here before this weekend but it never came. instead of forcing the camera to slow the shutter speed, I just went into set up and slowed down quite a bit (from 60 to 30) if it looks good there Ill kick it up a notch to 40, then 50, untill the rolling shutter comes back. Im hoping for good results as Im doing video for a SHIT HOT 10 man team at a local 10 man speed competition tomorrow. I also have a friend who thinks he has the 55mm ND filter and hes shooting one of the other teams. Ill try to post video from different shutter speeds and w and w/out the ND filter. Thanks for all the great thought and ideas.

Any help would be appreciated, Im flying the Sony HDRCX405 and getting a bit of wave through the screen on play back. Everything inside the plane and under canopy is awesome but that little bit of wave in freefall is frustrating. any advise?