I'd make a more simple, rectangular room out of it, rather than the T-shaped one.
Personally, I like not-so-near field listening position. So, placing the speakers on the shorter wall would be my choice of setup.
My room is not as long, but its width is almost similar to your basement's shorter wall (19.5 feet). I wish it's a bit wider by a few feet, but this is good enough, I think.
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