For me not so much the sporran as the sporran strap, which does its best to try to cut the front of my kilt apron in half just below my massive gut (which I call my "next of kin"). I am a full time convert to sporran hangers, although this adds the weight of my sporran to the front of my belt which sometimes also tends to drift south under the strain.

I too tend to use at least a small belt pouch for the comomon use things---change, folding money, credit cards, etc... to try to lighten the load on the sporran itself.