They're most of the way through 82nd and close to maximum rested now.
Have been distracted by my DK's, listing speculation items on the AH, and the itch to rewatch Firefly/Serenity.

At 80th, in iLV199 gear, they were 3k DPS vs the level 80 (normal) target dummy.
Four moves then a finisher gave the Predatory Strikes instant cast every time, for an hour or so of playing with DPS rotations.
Ended up with the Mangle-Rake-Mangle-Mangle-Rip rotation, simple and easy.

The 4% heal (on a Crit) from Leader of the Pack, has accounted for 99% of my healing.
The only time I've needed to actually heal, is attacking elite mobs +1-2 levels.
Using Grid for 5x Healing Touch, every 8 seconds or so, as easily been sufficient to down these mobs.

I don't like that its a GCD to heal, and another to resume Kitty.
But, mana is essentially infinite, thanks to Leader of the Pack.
I've done 5x Rejuvenation on random players, and that seems to hit decently hard; Lifebloom seems to be more of a topping off power now.