The stage 2 buff stops being logged as a proc and is instead a refresh. It's the same reason Aldriana was asking people doing the original testing to sit there and cancel the buff before it hit 50 to establish the proc rates. So yours got to 50 and then stopped, while the legendary goes back to 0 so it keeps proccing for the entire fight. Note yours got to 50 in about 2 minutes, and in the first 2 minutes he got 49 procs as well.
Anyone knows how to extract meaningful numbers from this parse? He got three Fury procs over a 6mn fight, but it doesn't seem his proc DPS or his total DPS was that high. 43k on H25 Ultraxion seems quite low to me, considering his iLvl.
From the looks of it, his DPS would have been fairly higher, but he had a few spots where he'd drop down to 20k dps or so. My guess would be from getting Fading Light right before an Hour of Twilight, as that can really kill your DPS as you spend so much time where you can't do as much damage. You also need to consider the person still getting used to the new proc and learning to use it to it's full potential.
Does Hit rating affect how fast the agility proc stacks on the legendary daggers?
It's a flat percentage to proc (depending on the spec you're in) from each hit / landed melee attack , so you'd assume it does.
Though I have no reason to believe this is not accounted for in Shadowcraft.