I have the exact same problem with the seatbelt on my driver's side. Am constantly hitting the release button to remove the slack. It's funny how dangerous it seems to me when there is a huge amount of slack in my seatbelt. I remember the days when cars were first getting seatbelts/shoulderbelts, and most people didn't bother to use them. We didn't feel like we were doing anything unsafe back then. I sure know better now.
Mike 1995 S420