You could start another thread--but--what you need to do is go to a BP/wing.
The OP is using a back inflate but those are compromise designs between a jacket and a BP/wing. Unfortunately in the metamorphisis they lose their balance. They don't have the plate to add rear weight, most of the weight pockets are in the front and most of those back inflates are to baggy--taco effect--which allows the partially inflated back inflate to lever you forward and face down. A weight belt may help but again, you will not like this, your solution is a real BP/wing and a weight belt.
If your using a fully integrated weight system and have to doff your rig how are you going to stay down and work with the problem with all your weight on the rig and none on you?
N