Toby, the Gator here bro... I am a heavier rider like yourself and have been through the ringer with harnesses and stitching rips in that exact reinforcement point you have sighted. When you ride powered as a heavier guy and know how to load it up, it puts major stress in this area of all waiste harnesses. Some manufacturers are hip to this and have already addressed the issue.
Dakine R&D worked this same issue out many years ago and now the Pyros are combat proven and ready.
Hopefully Pat Love
will as well...