lol, as what I've seen right now, which is nothing of hunter pvp in beta, no one really know which is best spec... as to pet, old joke aside, its going to come down to crit buff, haste buff or multistrike buff.. for pets. I'm hoping Survival emerges as a true viable pvp spec, so I can tame a hydra so I can name it Ghidora(mind u the last version of him from Final Wars).... and yes I would name my hydra that too.. :P
Mine was more a sarcastic response to this guy going around 15 different threads asking the same stupid question.
To greatly simplify the math above, the calculation for % change = [(new - old)] / old.
(170 - 150) / 150 = .13
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Are you fighting higher level dummies? I believe we still have chances to miss when going above +3.
Edit* whoops, I saw you asked that in the second part of your question. Raid dummies are probably scaled up. Try against a 90 dummy if they exist.
Just a quick point, that despite the wording in the talent saying "Increases the effect of your pet's Combat Experience to 70% of the increased damage", both the tooltip on the ability and the datamined buff actually increase combat experience to 85% increased damage, which is a multiplicative buff of 70% (50% base time 1.7 = 85% damage increase).
It seems that the talent is badly worded or simply mistaken.