Originally Posted by
Jackalope
Never use training dummies to test whether a certain gear set (or talent, glyph, etc) is an upgrade. Unless you have an entire raid with you to debuff it and buff you, you aren't going to get the true value of an upgrade. They are of course good for getting your rotation/priority system nailed though.
Are you able to use SimulationCraft at all? If so, you might want to see what it says and how that compared to AMR, although it likely won't give you accurate info on cleave effects like the Fusion Fire-Core unless you specifically tell it you have multiple targets.
If the Brutal Talisman doesn't put you over expertise cap, using it and Alacrity of Xuen would probably be best on a single target fight because giving boosts to two different stats tends to be more powerful than simply giving a double boost to one stat. You'll likely notice this effect during your opening CD pops, unless you already have so much haste that it puts you over the soft cap of 50% at 21250 haste. If you're going past that then you'll likely be better off with other effects.