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I can try to help, also for "Difference in skill usage HP thresholds." Look at my user page for this.
I have completed all difficulties and ran many times for Normal including four Hard Runs (Three Hard Raid were successful after the first one failed at 9% HP).
In Hard, it is more hell and at around 15% HP left, Girgashiy starts to use skills more randomly rather than spamming a single skill like in Normal, unfortunately I need to run more Hard Raids to confirm it, since it is so random now after reaching 15% HP left. The only same thing for Normal and Hard is after below 5% HP, it gets easy, back to only using two skills, hail and staff swing.