Now level 36 and so far I've only been spamming one key for my warriors.

I spam...

/castsequence charge, charge
/cast [combat] heroic throw

/cast battle shout

/cast overpower x 8
/cast execute x 8

/castsequence reset=target rend, thunder clap, mortal strike, mortal strike, mortal strike
/cast cleave

/castsequence mortal strike, mortal strike
/cast cleave
/cast sweeping strikes

/cast victory rush

and IWT it seems to be effective -