The easiest experiment to try is changing you posture by either moving your position closer or further from the piano. Try also vertical displacement. See if any of those changes decrease the torque in your arms.
Perhaps also you just need to develop the muscles in your wrists & hands more.
Good luck
For one, changing position is a good idea, but not a solution, and for two, their are no muscles in the wrists and fingers, so no.
Playing with tension means you have bad technique. You could be able to play all the TEs flawlessly and still have bad technique. You need to do something radical about it, NOW, if you want to keep playing the piano.
First, if you have a piano teacher, tell her about it. If she tells you pain is normal, get a new teacher. It is perfectly normal to feel a little sore and tired, but not pain!
You have to train your arms to relax at the tiniest occasion. For the 25/1, try this:
Play one group of 4 notes at speed and the next note, stop and relax, play the next group, stop and relax, etc... Then do this with 8 notes at a time. Gradually you will get better and better at relaxing in shorts amount of time.
-Monsieur Le Renard.