So, played a bit this weekend and now at 39. Running +1/4 pretty comfortably, although I do hit an occasional problem when I get cocky.
I did test and they get no recharge benefit from speed boost. I figured what I read was correct, but only took a few minutes to test. Since we are running i25, figured it wouldn't hurt to make sure there were no stealth changes.
With Fulcrum Shift, things really are melting. Still mostly single target, but each target goes down fast.
As far as defense, I am feeling pretty good. If there is no boss, they survive pretty well with just Transfusion. Vs a Boss, I send in and wait about 5 seconds and then trigger Fortify, which will generally be 4-5 stacks by then. I have tested vs Purple bosses, and I can mostly just stand back with an occasional Transference, but for the most part, with Fortify at 5ish stacks, Maneuvers and 2 +5 Defense IO, they are pretty hardy. I think that puts them at 12% innate, 17% Fortify, 3% Maneuvers and 10% I/O puts them near cap w/o Powerboost. If a Lion roars, they are at cap (Lions give 6% Def for 15 seconds every minutes) I do often lose 1 T3 wolf from the boss if they have a strong single target attack before Fortify though. Add in the natural resistances and added resistance Increase density adds (and 1 10% resistance I/O) and they are more durable then my Necro/Cold zombies.
When I do die, it is generally because I have gotten aggro and not dealt with it correctly. I am also poor at ambushes, but both of those issues are because I rarely play in bodyguard mode and am slow to react and/or take myself out of bodyguard inadvertently because I am so used to directing attacks.
I also tried some grouping, and it went well, but with Kin, I would expect no less. Pets generally stay out of the way, but speed boosted wolves pulling a second group is a real concern.
This is a VERY active character. I am always doing something, and with Transference and personal attacks, I don't have the excuse of being out of end. (As far as personal attacks, I just have the Hawk and the one from Sorcery. Adds some DPS, but also the Hawk brings down most flyers and the Sorcery one is required for the Mez protection. I may drop Hawk at some point. I had the AoE, but I found it drew too much aggro.)