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Tension between the shoulder blades could be a result of a few things. Holding the guitar too high, causing pinching in the shoulder blade area could be something caused by sitting on a couch and playing. I know it does for me. If I’m on the couch, I need to be sitting right on the edge of the couch, and not leaning back into the couch. Same reason I always use a strap. If I feel slack in the strap, it tells me I’m leaning too far forward. This puts stress on my back when I lean or bend too far. Also, doing the warm ups that Tony teaches may help relax the back as well, eliminating some tension. I personally think posture is extremely important for playing. Holding the guitar in a comfortable relaxed posture removes tension from your body and your mind.