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My doctor told me the tightness is from internal scarring and healing. They really do stretch the muscles wide and the top layer of muscle is cut and when heals can form a thick tight scar internally. The suggestion was to do gentle stretching excersise up to ceiling and side to side..with time it stretches out and hopefully feels better. I have been doing that for the past year and although it is still a little tight sometimes, (I notice it more when I swim laps and have to lift my head back over my shoulder to breathe) I do notice the difference.
Hope you can try that and see how you go.