I am hypo and if my TSH gets over 3.5 or so I feel low energy. You may have been hypo for quite a while and used to being low energy, but believe me, if you get the proper thyroid supplementation it makes a huge difference in your life. Having normal energy is awesome.
I know people say don't trust the TSH test, but it has always worked well for me, and I get symptomatic once my TSH goes out of whack.
I would suggest trying supplementation. You are not off very much, so it would probably not be a very high level.