So I did a bit of research and since you have Motionbuiler and Perception neuron mocap device then the easy way is to content the suit to MoBu. Motionbuilder my it’s self is for practical reason is a head application for most if not all motion capture devices and as luck would have it Perception has a device available to MB for just that purpose.
Once connected you can characterize your in game model and set it’s input to target the Perception input and tada MB will automatically adjust the spacial difference for you.