Oh oh, just wanted to add a few things. I meant to post last Friday but I got busy at work and ended up going home without thinking about it.
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The Rip at 4 or 5 is always a choice.
It is only a choice as much as Ripping at 3 CP would be a choice. (i.e. you can do it, but you will gimp your DPS) We used to Rip at 4CP, or 5CP if the previous attack was a crit, because we gained no visible benefit from Ripping at 5CP. The base damage was a bit higher, but it did not scale with AP any more than a 4CP Rip did. Now that it does, it's much better to wait and Rip at 5CP.
From WoWWiki:
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After version 1.12, Attack Power started being factored in for Rip, at a rate of 6% AP per combo point, from 1 to 4 combo points, and then 24% AP again for 5 combo points.
After version 3.0.2, 30% of AP is included in 5-combo Rips, instead of the previous 24%
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've seen this before but couldn't understand how much of a difference it would make not to clip Rake
This is the same as clipping any DoT, really. The difference with Rip is that it takes time to build up while Rake can be reapplied at any time. If you reapply Rake before it's gone, you can cheat yourself out of one, or more, tick (may not seem big but if you do it every time it'll hurt your DPS).
If anyone is unfamiliar with the mechanics, this is a summary of how it works:
Rake deals damage on use, and then ticks every 2 seconds.
Let's say the tick timer is at 1.5s, only 0.5s away from ticking, and you reapply Rake. What happens is that the timer is reset and you have to wait another 2.0s before it ticks, effectively giving that tick a 3.5s timer, lowering its efficiency, blah blah yadda yadda.
But like any DoT or debuff, the longer you wait before you reapply it, the more energy-efficient it will be and your damage:energy ratio will be better. Same as Mangling 1-2s before it fades rather than 5s before gives you more "bang for your energy" (36 energy every 17-18 seconds versus 36 energy every 12-13 seconds). Also, with DoT's, the very last tick always occurs when the DoT fades, that's why you let it fall off.
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My problem with trying to use FB is that I never seem to be able to fit it into my rotation.
I personally don't use FB much either, especially since I modified my spec/glyphs a bit more toward tanking. I dropped the Mangle glyph to pick up Growl, so when I DPS I need to refresh Mangle that much more often and it leaves me with very little energy to spare on FB. It's likely a problem you'll encounter unless you have a cat-oriented build.
My advice would be to not worry about it for now and just focus on keeping your DoT's/debuffs up as much as you can. You might be able to FB during Berserk only, but that's fine. In 3.1 it'll be easier to FB anyway.