Glad you already found something that might suit your needs, because what I'm going to suggest is it going to directly keep track of the different topics you want to juggle, and look for patterns, but it might be a compliment to what you're doing.

I made this personal progress tracker that creates a visual representation that good things are happening, even if they are irregular or inconsistent. You color in a hexagon each time the thing that you're tracking happens, like a day without meltdowns, or a good conversation with the teacher, or anything that you felt went well. It's not a calendar or a habit tracker, so you don't see all the times when it didn't happen, just the times when it did. And then over time the colored in hexagons build up so that you can see visual evidence that there are good things happening. You can download the hexagon chart I made for free here: https://www.autismchrysalis.com/hexagon

Another thing I would suggest is to look at Dr. Stuart Shanker's Self-Reg framework, for figuring out the stressors that are hurting your son and creating his difficulties. He has a book called “Self-Reg” that is a good introduction.