Actually the Priests in SampleOutputPTR weren't doing anything particularly special.
Bloodlust/Heroism was used late in the fight.
The default Priest race in SimulationCraft is Night-Elf, not Troll (it supports all Priest races however) and so there was no berserking.
The default Priest profile is an enchanter/tailor, not an Engineer.
It did however pop a Potion of Speed right near the start of the fight and so it had an extra 500 Haste Rating for most of the fight, however when Bloodlust/Heroism was popped around 25% boss health left, it recast SW: Pain and so instead of rolling 500 Haste Rating it was instead rolling the 30% speed buff from that.
So basically, apart from popping a potion, and recasting SW:P during Heroism, it wasn't going out of its way to exploit anything. When I did experiment with early bloodlusts, and Trolls etc. I saw even higher numbers.