I played through most the content in coop so not too sure about witch doctor solo. I cleared act 2 and 3 with monk+WD(me)+2 DH. Act 4 still impossible atm. Still, some elite packs that spawn crazy abilities you just have to skip, there is no way around this. This is easier in coop because one person can lure them away while you teleport to the furthest out body to bypass them. As solo you need to do something similar, lure em and park them somewhere, then revive and run the other way. If they are too crazy strong and you cannot skip, don't be afraid to remake the game. As for killing them, you need hex and wall of zombies to block them off, and enough room to kite backwards while you dwiddle them down. Also get Fetishes to block them off and Big Bad Voodoo to increase your damage output. It will still be impossible if you don't have enough dps to take them down fast enough.

Your stats are from my experience the minimum to clear act 1 but not enough for act 2. The most important thing you have to do now to deal with act 2 (which is the common roadblock for everyone) is gear up more. For reference I have 32k hp and 35k dps. Not a single piece of gear I bought for more than 80k gold, only my weapon would be worth more but I found it myself. Off the top of my hat looking at your stats, you have very high attack speed, that is very good if you have enough mana regen to not run yourself out of mana. Now you will want to get all the +dmg and +int you can. First thing buy a mojo with the highest +damage you can find, this will be a good upgrade. If the dps on your weapon is low you need a new one too, I have 900 dps 1-hander with +120 int. You need atleast 800 raw damage on it.


And yesterday I played on my Demon Hunter and did act 1 solo. I had spent all the gold I had, 1 million, on gear and my stats are 25k hp and 55k dps with sharpshooter. It was seriously retarted to play like this coming from a Witch Doctor. I melted everything I came across before it even got to me, including all elites. Just spam Nether Tentacles, everything dies. There was a mini-boss I found dead offscreen without even seeing him alive! Apart from the butcher who oneshot me a few times it felt like playing normal difficulty not inferno. Will try act 2 solo later, that should be a lot harder.