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.