I hear you.  Three weeks is a long time.  Alex has a good idea going bigger to give your skin a break.  I changed around from gauze/tape to large bandaids to gauze then bandaids again.  I finally decided on big bandaids and just rotated it as best I could to move away from the torn up skin.
Also, I did something else the last week before the end.  For about an hour before my shower each day, I removed the bandages and put antibiotic ointment all over the torn up skin.  I added antibiotic ointment to the top of the exposed square also, so that it wouldn't dry.  I would just sit still on the recliner and play online.  It really helped.  I don't know where you live, but hopefully not in a cold climate.  It was a bit of a challenge since the temperature has gotten cool here, so I was cold with my exposed chest!
It doesn't last forever. Fortunately, my skin was numb where the tearing was, so it actually didn't hurt, I just knew it wasn't good.