There's extensive discussion on haste vs. mastery somewhere in this thread.
Summary: even in BiS, mastery is probably better than haste with real fight conditions and the RNG involved in RPPM mechanics. However, a ratio of haste to mastery is optimal on average for patchwerk fights. This is probably what ShC is trying to get you to do but you can't just press auto-reforge to get there because ep is not automatically adjusted. The difference is likely ~1% no matter how you reforge though.
There's an option to force mastery > haste in ShC now. Check the Advanced tab (and make sure you adjust expertise appropriately as well, otherwise it will default to .7 and uncap you). This is what I use.

MMO-Champion

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Right now I'm struggling with my dps, shadowcraft makes me hold onto 2pc t14 because the bonus is so good. Even when I have head 496, shoulder 483. Prolly when I finish the legendary chain to get meta I will switch to 522 helmet [if I get one]. But even with 2 pieces of t15 - Shadowcraft still holds the t14 2pc is better. But it's imposible for me to get heroic t14 so what should I do with that?
