With your insulin insensitivity and difficult assimilating glucose, why are over stressing your glycolytic system with FTP an VO2 max work???
Very clearly overreaching with the program as others have noted.
When I was young, I would race on the weekend or do long rides. Rest Monday. Sprints Tuesday. Short TT Wednesday. Intervals Thursday or easy spin. Easy spin Friday.
I still ride 9-16,000 miles per year and could not do the intensity that you are doing nor would it help.
When my FTP was 280 watts, I would cruise at 200-210 watts for 12+ hours as you desire. The key isn't FTP, it is LT1 and for you as a diabetic, the ability to burn fat is essential or really paramount. I would focus on volume in zone 2 but no higher than low zone 3 in order to minimize glycogen use and maximize fatty acid oxidation (beta). Your current approach is counterproductive. I would recommend reading Alan Couzens, inigo san millan, and Phil Maffetone. If you only want to do a fast 40-60 minute time trial, contact Coggan.