F. Alton Everest ("Sound Studio Construction on a Budget", "The Master Handbook of Acourstics") and Robert Harley ("The Complete Guide to High-End Audio") seem to agree that on front and back walls, diffusion is best. I put an array of four RPG Skyline diffusors on my back wall, and am extremely pleased with the sound. I have DIY designs for imitations, also for RPG's "Omniffusor", which should work about as well as the Skyline--contact me if you're interested and able to cut Styrofoam accurately into "towers". Your bookshelf is a pretty good potential diffusor already: try varying the depth of the books. It might look odd but sound very nice.
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