I set the sag/tightness by grabbing the ridge line and giving it a twist. If I can rotate my hand 90 degrees it is just right. Any looser and there is a ridge pressing against my left calf. When I'm in the rack, I can still rotate the ridge line a bit between thumb and fingers--- taut, but not guitar string tight. I do set it with the foot end just a little higher. The ring inside the left pull-out is a little below my elbow when I'm stretched out and my feet are a couple inches clear of the side. I'm 5'10", so 6' would be a full load I think. If the hang is too loose, the area gets smaller too-- more bow.
Setting the side pull-outs well makes for more room and keeps the sides from sagging and flopping and the bug net out of my face. Higher is better. A few degrees change in the angle of pull can make a difference.
I don't get it with the ridge line. If it is truly structural, it should be able to take the stated load without breaking. Granted, if you string it really tight, it does have a lot more stress on it.
Take a look at Hennessy's setup video-- he strings it flat-- no 30 degree biz at all. http://www.youtube.com/watch?v=cfNIr...yer_detailpage
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