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I would pick the win cons you like most. For example Vampire Control 2 I have 4 Bloodline Keeper Flip as my primary win con and 3 Jace, Memory Adept as my secondary win con. So you could always do something similar, pick one to boost the numbers and keep the other cards as is, but again:card draw lol. The 1 Detention Sphere doesn't do too much for you. I'd add more of them if that's affordable, and the Warleader's Helix is just a bit too expensive in terms of mana cost for my own personal taste, so I'd mainboard the Mizzium Mortars for cheaper removal. I'd also switch out the Cancel s with your Essence Scatter s
Essence Scatter is great for the current standard because it's so creature heavy : ) but I would agree that AEtherling is a solid win con, although it definitely requires a war of attrition since at best you would have to swing him 4 times to deal out 20 damage, and Assemble the Legion would be good too (again, war of attrition. but that's the essence of a control deck). I f you go with Assemble the Legion though I would try to find some populate effects to increase the amount of tokens you have. Sundering Growth could help you with that since it's a solid control card that is either W or G
For America control you are focused on Boardwipes and counterspells.
Boros Charm is not needed in the deck. You arent burn and you dont have any creatures to save. Cyclonic Rift
is better because you can counter all the creatures. Sometimes they just need to bounce. The overload is game breaking control at 7 mana. Rift allows us to go small or go big with it. That flexibility is better for a long game which controls does.
Beck / Call
The call part is a perfect finisher with 4 flying damage a turn. maybe theros will have a better finisher.
is removal and ramp all together.
But Boros Charm has the utility that Cyclonic Rift doesn't. It can't make AEtherling indestructible (since it is the win con that would be good to have in the event of Supreme Verdict .) And it could also be a game finishing card if the opponent is down to 4 or less life points. That's a much faster game finishing card than Beckcall.