Was it a 3 season Yeti, and what kind of temps?
When you moved the Yeti to one side, was your back still warm? If so, I'd say you clearly do not need that Yeti until it gets colder.
I have been able to do some pretty major venting with my CS Yeti just by moving it a few inches towards my head. That combined of course with venting from the top side.
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