Life Leech Question

Is the 5% of max life leech per second doubled to 10% if wearing Cherrubim's Maleficence? How does the passive(and other life leech nodes) interact with the body armour?

Each hit you make creates a leech instance.
By default that instance is capped at 2% of max life per second (the number of seconds depends on the amount you leeched)
All the instances from you hits run simultaneously but the max leech rate you can get is 20% of max life per second.

Cherrubim's Maleficence increases the leech rate of a single instance to 4% (100% increased).
The +5 to max life leech rate increases the maximum rate of all leech instances to 25%.

Most of the time, the first one help against a single enemy and the second one against packs.

Interesting, thanks for the info!

Also note that both increased life leeched per second and max life leech rate are rendered meaningless if you have vaal pact (or another type of instant leech)