EM to me always sounded the most impactful. Whenever you hit something, everyone hears it for sure. That's just from a spectator viewpoint. I can't speak on its actual damage because all the hearsay about how gutted the set is strayed me away from trying it.
As for looking at the set and touching it up, I can think of a few low impact changes that might help the set, but this is just my opinion - one of many.
First of all, I would wanna change Stun. It's just too slow. I would give it the Cobra Strike treatment. Way more damage and possibly a faster animation so that it's worth taking.
I would give Total Focus the double-handed Knockout Blow animation. And cut it down to about the same animation time (or possibly shorter) as KO Blow as well.
And then for ET, I would honestly just increase the damage. I think the animation is fine, but the move should hit like a dump truck. If I'm channeling my life force into an all out attack, the opponent should be blown away, but right now the damage is comparable to other T9's at best.
Also buff Whirling Hands.
My far-reaching idea for the set is to give it a sort of "concussive strikes" gimmick. Maybe something like after hitting so many attacks on an enemy, the stuns start turning into low mag holds or something similar to that. I don't know how easy that would be to balance, but to me it compliments the impactful and overwhelming nature of the set.