Well of Blood has a massive initial heal (larger than Blood Fiend's) and heals all allies in that location. I use it all the time because it can drastically improve the durability of minions and surprise people that try to fight them.
Really, it's in the best thing for you. As a minion master, you want to spec heavily into defense (On Necros, that's Death Magic and Blood Magic, which are the two lines with the best minion traits). You don't need the offensive traits because your minions don't scale with your stats. Using a staff as your primary weapon and dropping Mark of Blood at your target's feet when minions swarm is also a good move.
You will have lots of survivability and you will be constantly healing your minions for a ton with high-power, long duration Regeneration and Well of Blood for the more clutch heals. If you really need more clutch healing than that, you shouldn't be in that situation (Blood Magic can reduce the recharge by 20% anyway).
It might be worth using Lich Form instead of Flesh Golem as your elite as well. One of the skills you get puts down a mark that spawns 5 jagged horrors, and all of the skills it gives have formidable firepower.
Try
This build. Recall that the #4 skill on the second weapon set causes regeneration, not swiftness. Alternatively, use dagger for blind and weakness (and ridding yourself of conditions). I think you will be surprised at how it works out.