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I tried a similar system but the straps seemed to give quite easily when tensioned ,I would like to give these a go to see what they are likeIn the video it shows a tool for removing the clips, but a simple kick to the side early removes them
They do have a curved base, but with large formats you nearly always use at least a 12mm notch and that easily copes with the curve, I've never found it to be a problemThe only place I know is N&C, ProtilerTools on the net sell them but they have a curved bottom but sell the large clips.... whereas on the there site they show the straps with flat bases.
Protiler told me Genesis now make them with curved bases..find that hard to believe personally.
They do have a curved base, but with large formats you nearly always use at least a 12mm notch and that easily copes with the curve, I've never found it to be a problem