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Hi. I think mememax gave a very good answer. The only thing I would submit for consideration is making too many changes at one time can be hard to track later. When we did the switch to https, I was super paranoid we would screw something up and lose rankings. So I chose to leave the disavow file exactly the same. It turned out the switch was not as bad as I thought and we didn't have any noticeable effect on rankings. So later when I was convinced that the https switch was not a factor, I could modify the disavow file. I also left the old domains from years ago in there for the reasons mememax points out. Good Luck!

Thank you