Just a suggestion, since the weather may be quite cold in your region right now. Rather than doing only a Sunday off, try every three days, or even down to two days, for each one day break. This is just to ease up the tissue stress loads. You can jelq, you can lightly stretch under very low loading, but apply heat. Lots of it. We discussed earlier about our brother's possible cross-linked tissues being way too thick and came up with a progressive method of countering it. Read through it, and hopefully you can stay ahead of the game. Ask questions if you are unclear about something.
Okay. This is what we've suspected as we discussed based on your posts so far. So, take it with grains of salt when you're reading these recommendation from us.
First off, we always talked about thermal application at body core temperature. However, because your tissues are so dense now, your collagen type I (the stiffer type) is higher than the collagen type III (more elastic). This is why you're not breaking. So all of us express thermal incline from core temp to as high as 110F. It's going to be quite warm. Go higher if you are comfortable and it doesn't cause heat irritation or...