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Thanks for the reply Phil. I have the same issue here with the strong NE winds off the water.

The height of the T-top creates a significant surface area on the tarp for the wind, so I'm hoping the "ribs" will take up most of the slack in the tarp and stop the flexing.

You've given me an idea with the strapping suggeston. I might try a series of inside relief cuts in the middle of the strapping strip where the bend wiill be to see if I can get it to conform to the needed radius if I can't get it to bend enough otherwise. Thought about water to add flex, and also steam, but wasn't sure how much it would penetrate?