With the advent of 7.2.5 and ToS, the go-to spec for Elemental Shaman is the ‘Gamble’ spec (ie. Smoldering Heart + Deceivers Blood Pact, with the Aftershock talent).
Since it requires one of the new legos, it is not widly used yet (https://www.warcraftlogs.com/statistics/13#boss=2032&class=Shaman&spec=Elemental&combatantinfo=Talents), but when it is, does way more damage than the classic spec.
I am bringing this up because using the AfterShock talent requires a change in rotation, in particular with regards to the Earth Shock casts. All the details are available on SE&L, in the ‘Smoldering Heart’ section (https://www.stormearthandlava.com/ele/legendaries/)
Side note, if you compare the ‘rotation’ section of this reference site for Elemental Shaman’s, you’ll notice several discrepancies between AMR’s APL and what is suggested. It is not as impactful as the Aftershock thing, but if you add up everything, it might make a difference.