Such is life with the PTR, however the changelog on Wowhead doesn't show any spell changes so far, it's still got that as the latest build. I understand that it can take a while to download the data and and then they have to process it.
I did this as I was interested in the results.
Do Not take anything here as fact, the PTR is ongoing and I expect them to do a bit of number tuning as they stated:
As players anecdotal reports from playing on the PTR and these Sim results show, that is not the case.
Given how long these types of sims take I chose to use heroic Tomb of Sargeras gear, although as I typed that I realised I didn't change relics, so it's got the (rather lucky) relics I've managed to get and level seven of Concordance.
I used their Goroth script, being a single target fight I didn't include the Predator or Brutal Slash talents, that would have just slowed it down.
I've got most of the legendaries in there, I left out the Balance Moonfire shoulders and the crafted one.
Being a Mr Robot sim you can see all the settings used to run it, I went with a time around the current 75th percentile kill time for Mythic.
The APL is still the live one, Swol said he'd tried tweaking it a bit and it didn't make enough difference. Having said that he'd tested before knowing about the Savage Roar snapshot change. I don't think it will make much difference anyway but I'm stating that here so you can't complain.
I'd already played around with other sims to see which legendaries I should use with my gear, they aren't the ones which score highest here.
This bit is probably most important and isn't what everyone looking for a BiS list, or legendary ranking list, wants to hear.
The best legendaries for your character will depend on what other gear you've got.
In my case I got super lucky and have a 955 Spirebreaker Harness from Goroth, it's doesn't have ideal stats with 1319 haste on it but at that ilvl it has a heap of agility on it. So that's one slot I'll be unlikely to be using a tier piece in. I was also lucky with a 945 Stormheart Headdress, so the Behemoth Headdress isn't what AMR recommends for me.