Sorry if my english is bad.
First, there's a bug about shock ailment that makes the game crash. I have to use frost ailment on railgun instead of lightning for that and a friend tried full ailment mage it did the same so i suppose that you'll meet the same problem ( if you are going to try it pls tell me if the bug occurs pls ;) )

Second, Zapstick convert frost and fire ailment proc to shock so you'll not be able to stack fire or frost anymore on targets. You'll stack up to 30 shock and not 2x30.

Third, as you mentioned it, you have to play with fatal pact and fatal pact will only heal you and not your summons. Why ? because shock stacks will not spread to your summons or i did not notice any nods that could do so.

If you're weapon wear lightning it will be tough to find the correct balance between physical/poison and rend to apply both of them. Curse and Weakness are easy to stack that's not a problem, stasis too. To me, poison or rend + ligtning + 3 occult ailment is possible but 6 of them i'm not sure if you can find a spell that can apply bleed and poison at the same time + you need to adjust your physical, rend and poison dmg to be able to apply those ... Moreover, if you pick the nod that allow your ailment to deal 5% more dmg (5 stack) your spell ailments could change and you could lose one or more ailment type. (i don't know if i'm "understandable" here sry xD)

Thanks, you're understandable enough. The reason I asked if fatal pact healed minions, though, is because it says it restores hp to allies in the radius as well.

I don't have the gear yet so it'll be a while before I test it, but I'll try to let you know if I crash when I get there. Thanks again.