(Ill go back and do a proper guide but figured Id toss this out right away seeing as there isnt a whole lot of time for the timewalkings left)
I just discovered that if you queue for a timewalk while in moonkin form it'll snapshot your mastery. Also As long as you phase in with the others (like you should) their mastery will also be greatly boosted. You HAVE to phase in while in moonkin form.
I've also noticed abilities like Incarnation , displace beast , and other form changing abilities will, in fact reset your mastery and you'll be dropped around 50% (due to the down scaling of timewalks)
I have not tried this with other classes as It was discovered by mistake, however I did test it with moonkin a total of eight times, All which have applied.