My sims do the same thing as arms. Bouncing either way depending on which I have stacked. I run a haste arms build... if you look across the spectrum its 50/50. Recently I even went as far as forging out of a bit of crit (not gemming) and when I get more data with the Gaze I'll post more, but I've seen the gain in melee a bit better than the Mastery proc. In answer to your question about the OpStrike proccing RPPM, yes it procs them.
This is a log just after I got the Gaze and went for a test run with a full haste forge.
http://www.worldoflogs.com/reports/r...0/?s=274&e=787
with this build
http://us.battle.net/wow/en/characte...ppolyon/simple
Also
---------- Post added 2013-04-27 at 12:41 PM ----------
@Roseby, I've seen your logs several times so I know of you and I know you're a great player....but, its on any crit (not like the enrage effect from BT as fury). So, with Overpower sitting close to 100% and the off chances of all of the rest of your abilities. Gaze isn't ever waiting for a crit to proc. I would certainly agree if you were talkin about MS crits and their advantage - but they aren't needed for the proc. I'm critting from something almost 100% of the time.