Nice HC DH. I would personally prioritize plvling and up your disc, but it seems you're all about the MF. On that note increasing plvl=increasing MF+GF, so that's something to keep in mind. Usually I'd stick to the bat/ferret, but you are running in HC so I can see how the use of the boar can be helpful. I also commend your passive skill choices, but I am biased because that's my passive setup as well. GG.
you dont need vault because monsters will be busy hitting other people + they pick up the orbs for you
Since you are taking out vault/TA completely in your multiplayer build I would consider the following:
Consider using suppression fire, full broadside rune, or even arsenal for your MS rune. Between the bat, punishment, vengeance, and HA I don't see why you can't do something with a little extra punch or +disc for stability. Personally I'd probably use FB//Arsenal unless you want to be able to keep your disc up for those times you need punishment//shadow power.
As for Archery//Steady Aim, I'd probably exchange at least one for Perfectionist//Night Stalker since you have a good amount of skills regenerating hatred. I feel like some kind of gain for disc will make your build a little more stable. Unless that's not a problem for you ofc.
TL;DR: Choose a stronger MS rune. You can afford it.