It's my safety knots tied against the cinch buckle being the main issue, and my weight is surely a factor on webbing stretch. No issues from the AHE or Warbonnet straps with or without safety knots. And no issues with DIYGS without safety knots (now 3rd night hang).
After about an hour long nap with DIYGS in the Safari and high winds, two safety knots against each cinch buckle, got a bit of pulling at the edges. Same as above. I think the small amount of stretch pulled against the metal is ripping the threads.