It is ambiguous, and awaits proper simming and/or Smart People™ to work it all out.
Part of what makes pooling so effective for Fury is not only that CSmash is on a perfectly predictable cycle, but also that Fury can line up SO MUCH stuff in its natural cycle (Enrage + Mastery with high chance due to BT Crit behavior, RBlow x1-2, Bloodsurge), plus those hard-hitting things are cheap so it's easy to then squeeze in HStrikes on top of it, and since CSmash is on such a regular cycle it's very easy to save and coordinate CDs without wasting them. Well, "easy" is a little misleading. Maybe "feasible" is the better word.
Arms is lacking... pretty much all of that. It makes "But look, I'm Slamming!" kind of pale in comparison when put side-by-side. :p
I guess the basic idea — try not to spend Rage unless CSmash is up — is at least more plausible with the increased Overpower consistency.