How have y'all been able to get the red under-belt to sit lower? I'd like to move mine down to sit on top of the crotch piece as I've seen in a lot of the photos here, but I can't figure a way to remove those 2 red belts -- mine don't want to seem to unbuckle in the back and I'm afraid of forcing something that may not actually function like a buckle, just look like one. I tried sort of pulling them down individually, but that was like trying to get water out of a boat with holes in the bucket -- I'd sort of get one side down a bit, then it would slip back up while trying to get the other side, or the back, etc...