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It's not really shadow frost. It just only uses obliterate for unholy runes, or if having high resources as HB priority takes more GCDs, or for KM procs. OBL is still highly used at around 15% damage contribution, down from 30% in a more normal priority. Rime is still useful.
I don't think anyone will be capable of putting out more dps on a pure mastery build with this priority. It's too error prone and requires too much focus. However, when resource starved in a more normal rotation you can very easily fill with HB and even game some unholy runes. And that alone is a significant dps increase. And in doing that you can easily get by with around 2000 haste.
@unspoonybard because they are ilvl 416 and have more str which outweighs the secondary stat difference. Also at the top end of gear haste rounds off to be no more valuable than mastery.
No doubt more tweaks can be made. I stopped once it beat unholy simming because that seemed like a good benchmark to reach. Feel free to do them and submit proof of a dps increase.