I'm glad you enjoy doing HIIT, isn't it awesome how it makes your body feel! I don't know about the variances that other people come up with, my guess is that they are relatively similar because it doesn't sound all that different. I would just stick to the plan just because there is this little bit of stress that comes from changing things up. It doesn't feel like a big deal at the time, but it can add up and make other little compromises seem like nothing when they actually matter. Thats just me, I know I stuck to it better when I had this feeling like "holy crap I'm actually doing it perfect". It just makes you more confident in the long run. There's the "butterfly effect", where a little change can make a big difference for an unexpected reason. That would always be in the back of my mind when I changed things.
© Abbott Laboratories,2013