There are more than a few folks who make good use of asym tarps, and yes it's my opinion optimal results require extra skill and dedication. In fair weather they are a joy and offer plenty of views and air.
I had used it as part of a UL setup with a SLS and it didn't work well. Can't say whether a larger size would help coverage, it might be worse since the longer ridge limits how low you can pitch and this is especially critical in an SLS setup.
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