Whenever I go into a fighting stance or do techniques I have a tendency to carry a lot of excess tension in my shoulders. Even when I consciously relax my shoulders, it'll be noted that I am "too tense." This has been an ongoing thing for over ten years and doesn't seem likely to reduce anytime soon. Things such as massage, yoga, chiropractic have helped, but are not a panacea and do not seem to be addressing the root issue as yet (though I have only started the yoga relatively recently).
This has a few consequences, one of which is that it makes proper flow for the techniques significantly more difficult and it raises the temptation to use more muscle than is needed. It also means more accidental projection of what I am going to do to my opponent.
So the question is: Are there any things I can do–particularly while doing the techniques, but just in general–that will help me to relax my shoulders and reduce my overall tension?