Always inspect your gear as you are hanging the hammock to insure one of the 'turns' is not on the side of the buckle as photographed and that the webbing is not folded or twisted as it passes through the buckle. I doubt that Dutch sent you nylon webbing by mistake, which would point to an error in setup and slippage rather than stretching.
The half hitch is not normally needed with cinch buckles (like it is with ring buckles).
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