wow, so you're doing 4 hours of HIIT a week instead of the recommended 1 hour? Where do you find the time?

When are you doing your workouts? All the advice that I hear is to do cardio after weights for maximum fat burning.

Personally I'd say I think you're overtraining which can lead to getting fed up with your plan, but more importantly can lead to injury, but what do I know, I'll wait for TrainerDan or someone else knowledgeable to comment properly on that!