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No worries, I think that's a fine approach.

Here's the mini-spreader bar configuration that I mentioned.

Then that's why you're not finding the asym angle that you want at the stated ridgeline lengths. You just don't have as much fabric to spread out.

I would try decreasing the ridgeline length by...

You've told us that you have an 11' hammock, but not how wide the hammock is. The amount of diagonal that you can obtain in a given hammock depends on the width as much as the ridgeline-length.
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