Hi Seedy,
Thanks for posting. We are actually going to produce a video in Sept that might help with this question. There are several reasons this could be happening.
First, make sure that you are donning your TransPac as another poster has already suggested. Be sure to loosen all the straps (chest, waist and shoulder) first. Slide into the harness and then lean forward and allow your body to support the weight of the tank (vs. a table or bench, etc.). Next fasten the chest strap making sure it rides at a 90 degree angle. Then the waist and crotch strap. Finally, tighten the shoulders. Often times, folks will tighten the shoulders first which "hikes" the rig up higher on the torso OR they don the rig with the tank sitting on a table/bench which can also create that "hike".
Next, make sure the sideplates of the TransPac are in position so that the back of the TransPac does not ride up on the back. A lot of times, divers will position the sideplates really far back, but not realize that this can also create the entire rig to angle upwards toward the back. Have someone look at your profile...the bottom of the TransPac should be parallel all the way around and not dip or rise. Make sense?
If you the above doesn't work, you can remove the top cam strap. While it's nice to have two, the TransPac doesn't require two for stability nor security. However, I think if you are properly sized, wearing a crotch strap, don the tank as suggested and the sideplates are adjusted you'll be in good shape.
Feel free to send pics to me at
kathleen@diverite.com.
Best,
Kathleen