So kitty is my offspec from tank, hince why i've been a little slow to bring this question up. However, now that i'm finally building my gear my rotation is gonna have to change.

Change? yes because my crit is getting high enough where my rip and SR are still ticking when i need to blow combo points. I'm thinking once my crit is a little higher, i'm gonna start the finishing move rotation, SR, RIP, FB (hopefuly TF is on CD) here, repeat.

I just don't like FB because its a energy regen destroyer. While great at pvp, FB seems to mean that i'm not going to get to use a move for 4-5 seconds.

Thoughts on this change in rotation, and its necessiity?

I just got 2T7 and with the Rip glyph, I'm now looking at a 19-second rip. That means working a FB in between rips on bosses. You'll have to see where it lands you, but I'd say even 3 points is a reasonable FB for mid-combat, but let your energy be your guide. If you're going to be blowing 10+ energy by FBing, just toss another mangle/shred and wait for it to pop up on the next one.

Actually because of the changes to energy regen, Ferocious Bite isn't really as horrible as it seems. I generally FB right at 35 energy. I don't see a difference between doing this and hitting mangle because it's the same dead space.

y rotation as it stands actually just involves keeping savage roar, rake and rip on the target and hitting mangles and shreds in between with FBs if rip is still running.

While I'm DPsing though, my energy is never ever going to be over 42 though so I don't find FB to be a huge energy waste. I don't ever recomend dumping a full 100 energy on a FB but tossing them inbetween rips is can get you some nice 8000-10,000 crits even with 35 energy.

hmm did some more experimenting, there seems to be some lag between when the 35 energy is used, and when the "added" energy is used, and during this lag period more energy regenerates... so its never just 35 energy, id' say i'm using over 50% nergy which makes this really ****ty. The RnT crit guarentee is nice, but without KoJ off cooldown, FB seems for situational only. I'd rather just spam shreds over the 5 point cap and loose the combo points sadly. For PVP its too bad FB uses 100% energy, i really wish it was more like eviserate. But i understand its value is too important pvp.

hmm to answer my own question: i found an obvious site that was pretty informative. http://www.wowwiki.com/Glancing_blow. verry interesting. So then past 40% crit, i'm curious useless crit is.