Question 1: Can you not add weight to volume day, intensity day, or both?
Question 2: What is your TM set-up, exactly?
Question 3: "I eat well enough" is something we hear all the time but is very often not borne out by reality. What does this mean, specifically?
It is very possible TM is not the program for you at 39, but your post leaves out too many important details to really answer your Q.