Problem is you're trying many different thing, and they don't synergy well.
Garg need high armor (use shield?) and fierce loyalty so it can regen and survive. Overall pets still doesn't work unless you really got very good gear.
Using BBV to boost dart damage just doesn't make sense when you have other skills that do way more damage
to multiple targets. 3 bears hitting 1 large target == 700% damage. You got your DPS boost up, but mobs will be all over you, and you are only hitting 1 at a time plus you cannot move away very far. Will GG very fast.
Fetish is not bad to distract elites and so on, but use up 1 skill slot. Fetish ambush is pretty powerful to save your skin when kena mobbed. Only problem is the high cool down so usually only 1 cast per elite fight.
But having 3 skills with high CD is ...

If garg, BBV and fetish all on CD, then you're just sitting duck.
WD is about managing your mana. I don't use VQ, don't like it at all, so managing mana is crucial to me.
Been experimenting using BBV with Rain Dance, but it limits mobility. Don't work well against all types of Elites or in all situations.
Normally I have 1 spam-able damage skill e.g. darts, firebombs, or spiders,
and 1 high hitting, high mana cost attack e.g. bears, bats, acid rain.
Switch between them depend on current mana level and your tactical advantage.
Haunt is another good skill, but I'm outta skill slots!
What is your weapon DPS? I think I got 1 500 DPS knife from my time in Hell. Forgot what's the weapon iLvl already. If suitable for you, you can have it for free.
Oh and enchantress got power armor, increase your armor by 15%.
Waah.. with your gear you still got issue with Act 4? Die la we all

i see, thanks for the advice...
gargantuan to zombie bear...
changing spirit vessel to fetish sycophants...
and how about fetish army > horrify frightening aspect (100% armor) / ruthless terror (gain 27 mana per horrified enemy)
ya using enchantress right now... she using my old weapon...
current dagger 249 dps only... around 150 int and 75 vit i think... socketed with flawless square emerald...