Round Sheet as stated perhaps slipped. If one rope smaller / tighter, that must be the locking hitch side especially single sheet. The larger/'fluffier' side of Sheet Bend the more passive bight; just like smaller cord for friction hitch grip on larger host.
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Echoing Del_ to on 'parts alignment' and seating at actual usage positions purposely crafted . Partially so don't give system on loading to impact into seating positions, sometimes errantly and many times over tight, more likely to jam. As like slop into rigid system parts being similarly problematic.
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If backleaner I think rope pull is to bring CoG uphill over the hinge pivot , to then 'splash down' on the fall side. Pulls when CoG on fall side I think are best to force stronger/earlier falling/thicker hinge. Wedge as a backup and extra force, also if folds when pounding easier to evacuate holding only hammer/not saw.
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I think the art (besides not getting killed) is mostly to use rope and wedge to target direction, NOT steering. Steering side lean mostly by Tapered Hinge (rarely spiced with step-Dutch inverse cousin) to ballast side forces out of equation leaving only forward force parts. Pull/push with rope/wedge to target to make stronger hinge, then let that stronger (Tapered) hinge fight stronger against side force.
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Rope angle to put some force against side lean
>>reduces some of pull that makes hinge stronger/thicker
>>when rope tension relieved stronger hinge part retained
But, side lean can impact back from effort part not used to make hinge stronger when rope /wedge force relieved that was ballasting against side lean.
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I think easy drop is great to instead complicate to slight side lean scenario.
Model fall straight into lean as all available force forward for most ground concussion.
vs. only part of force forward, some across, so not feeding into strongest part of gravity pull. Also practice more, will make you luckier and everything more intuitive.