I think we're using different language to describe the same phenomena. Steeper pole angle: slacker ridgeline; shallower: tighter. As for relative importance of ridgeline slope, I'm not sure how to rank. I've consistently been able to remove ridgeline slack by lengthening the ridgeline, making the poles shallower.
If I tilt the stand more than a little, my head tends to contact a pole, while letting out the ridgeline improves clearance.
edit: in trying to reconcile our differing results, it's clear i'm missing something. you qualified your conclusion with "unless the ridgeline goes slack." Well, that's what happens to me frequently (doesn't happen in your footage), and it's my cue to let out the suspension, whereupon the ridgeline tension increases. Now, unless I adjust the guyline length to compensate, this increase in ridgeline length results also in greater tilt, which you posit as the most significant factor. Maybe you're right.
i do love the subtlety here, such that mysteries remain in what seems so simple. deceptive!
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