Thanks Spirou, I'll check that out also. I'll tell ya though, GamParse is fantastic. I love the way it puts every fight into nice lists, graphs, group-member breakouts, etc.
If anyone's curious, it turns out Burning Rapier primary and Gloomwater Harpoon offhand was noticeably higher DPS, I'd say between 10% and 15% just going off a couple hours in Mistmoore. Yeah, my backstab numbers are lower but so what — it's still the more effective combo and my overall DPS was consistently at the top of the group list (sometimes #2, damn monks). There was another rogue in the group using harpoon as primary and was consistently at the bottom of the list, but in fairness I don't know what her offhand was.
In summary, fellow rogues: if someone tells you that higher-damage weps always trumps speed in primary, don't just accept it as gospel. Test it. My scenario has proven to me that speed kills.
Also, what Dersk said above is correct: offhand swings are not dependent on primary swings or hits (two people tried to /tell me that since I started this thread tonight). Per Dersk's suggestion I invited them both to put a lightstone in primary and see if their offhand never triggered. They just laughed but I went ahead and tested it for them. Sure enough I was hitting with offhand just fine
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