I've done some work with Nightcrowler's simulator to try and determine how we will want to use Ferocious Bite in 3.1.
As far as how the simulation decides when to Ferocious Bite, here is the explanation from Nightcrowler:
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3) Use FB if the condition are good: I've made some theorycraft about it. Basically the program compute on the fly the average waiting time to generate 2 cp to refresh SR and then 5 CP to refresh RIP (or the other way around), then it compute the DPS difference between FB and RIP and the acceptable RIP downtime to find the right SR timer and RIP timer value condition to use FB. The value that you will found in the sim report are based on normal condition (no heroism, no berserk) the value used in the sim (and that I will use in the addon) will adjust themself on the fly.
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I modified some of the debug output of the simulator to give me a good picture of what was going on when it decided to use Ferocious Bite. I've put a couple of the fights into a google spreadsheet along with average dps using the default setup in the simulator at 10,000 5-minute fights both with Ferocious Bite and without it.
http://spreadsheets.google.com/ccc?k...VMwmnCzxIt5OQw
A quick breakdown for those that just want the info:
Average DPS w/FB: 6532.71
Average DPS w/o FB: 6387.25
Ferocious Bite seems to typically be used when energy is at 35 and the timers of both SR+Rip are more than 24. There are some cases where bite is used with energy levels as high as 83 or with SR+Rip timers as low as 18 seconds, but they are a bit more rare. Individually, the SR or Rip timers may be as low as 4 seconds. As long as the other timer is fairly high, the simulation still deems it a DPS increase.
When viewing the debug information, I was also able to see the time in the fight that the Ferocious Bites happened, and many times the first FB occurred at about the 14 second mark. This is about the right amount of time to get a Mangle->SR->Rake/Shred/Berserk to 5CP->Rip->Rake/Shred/Mangle to 5CP->Ferocious Bite while still having 4-8 seconds on SR. A 2 CP SR would then be used to get SR back up, then 5 more CP to refresh Rip when it falls off. This kind of management of the timers should allow about 7-8 Ferocious Bites in a 5 minute fight.
If anything, it will be better to err on the side of caution once 3.1 comes out. Nightcrowler is also developing an add-on that will compute all the same values as his simulation does and indicate when a FB should be used for a DPS increase while in-game. Until then, or for those who prefer to not use addons, this should help with determining when to use FB to maximize dps.