Originally Posted by Orlgin
FT is overperforming on the sim. The simulator is showing FT is hitting on every swing that an enhance uses but that's not true if you are using FT/FT. Go on a live shaman, use FT/FT and count the number of hits versus the number of FT procs. They aren't the same. Stormstrike will often record only one FT even though you hit twice. I was testing FT theory back when the Lightning capacitor didn't have a cooldown and noted at the time that FT/FT didn't proc as often as it should.
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Yes, i roughly came to this same conclusion yesterday when i hopped into DM north on PTR to test a dual FT setup. Some basic weaponspeed interaction with dual FT showed me this (no flurry, no UR, naked only swinging a combination of vendor weapons).
2.5/2.5 (136.7dps) - # melee hits == # flametongue procs (100%)
1.4/1.4 (157.7dps) - # melee hits == # flametongue procs (100%)
2.5/1.4 (137.4dps) - # melee hits =/= # flametongue procs (90.8%)
1.4/2.5 (138.0dps) - # melee hits =/= # flametongue procs (91.4%)
No matter how much haste i introduced (flurry/WFT/DST/BL), equal speed weapons nicely procced every possible flametongue. It's only when swings overlap either due to different speeds, when you are parrying attacks or whenever you hit /startattack before you are in range, that flametongue procs seem to get lost.
So what's the cause of these lost flametongue procs? Is it latency? Since there is some delay between the weapon hit and the proc some may be wiped from the queue? Or like Windfury Weapon maybe there is some small hidden cooldown to prevent chain proccing, seems likely.
Like already said, FT interaction with SS only gives one proc, if dual enchanted the mainhand proc seems to put the offhand proc on cooldown.
Funnily enough two different ranks of FT do yield both procs on a SS (sounds familiar to the windfury issue we had in TBC

) Whatever fix they made to prevent chainproccing they forgot to include cross ranking. Even looking a bit further and checking out Frostbrand shows even more how big of a mess the coding of weapon imbues is. There seems to be 3 checks for a FB proc on a SS (debuff/mh/oh) resulting in triple procs quite often when dual enchanted.
All in all we can honestly say that the weapon imbue system is a mess and Blizzard never really bothered to recode it to properly behave with dualwielding. Band-aid fixes to prevent abuse of messy mechanics is all what we have seen.
I'm fairly sure this is why Blizzard is hinting us to use two different imbues in Wotlk, WF/FT will be the combination for lvl80 trust me. They won't remove the choice to dw same imbues no, but they won't bother to recode them either.
Edit: A quick test on blasted land mobs, using two different ranks of flametongue indeed shows that there are no lost procs compared to the ~20% lost using same ranks due to overlapping swings. So i think we can honestly say that there seems to be a small cooldown on the proc.