I think that if you are that unhappy with a program, that you probably won't stick with it.
Have you tried subbing one of the HIIT sessions for LISS cardio that you used to like? You're doing a lot of sessions already, so replacing one with LISS would probably still have benefits of the HIIT but also let you have your "fun" cardio, too.
And you can always do what the book recommends, start with 15 minutes or so of HIIT and then follow it up with some LISS.
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