Support Gem for tempest shield

I'm using tempest shield and i have 3 sockets to support this skill gem, 1 is necessary reduced mana, but the other 2? i'm thinking on blind or culling strike and knock back, which is better?
Which support gem works better against bosses?

If you have a lot of strength iron will can be useful

Life Leech / PCoC is very nice for it.

Wont that just increase the mana reserved?

can't use those skill gem, cause i can't crit and the tempest shield dmg is halved by avatar of fire.

The more damage you do the more "life leech" gives life to you? Tempest shield doesn't do impressive damage

Just put blind for fast hitting enemies. Everything else is fluff filler. Run another aura if possible.

Curse on hit. Essentialy, it becomes curse on block. It's a single target curse, but it'll be a high level curse instead of the lowly CWDT curse. Good for bosses. Needs 4l with reduced mana gem.

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Sentracer wrote:

Curse on hit. Essentialy, it becomes curse on block. It's a single target curse, but it'll be a high level curse instead of the lowly CWDT curse. Good for bosses. Needs 4l with reduced mana gem.

So you need:
1. Tempest shield;
2. Reduced mana;
3. curse on hit;
4. curse.

Wouldn't it be more effective to have curse somewhere else + increased duration + increased cast speed + increased radius? It doesn't take much effort to cast curse manually.

EDIT: does tempest shield has a chance to deal critical hits? If yes, than maybe use this:

1. Power charge on critical. Every time enemy hits you and your tempest shield does critical, you get power charge.
2. Added lightning damage. more lightning damage - bigger chance to shock enemies? Shocked enemies get increased damage.