What's a good goal for ignite proliferation radius?

1) I am sure more is better but how big of a ignite proliferation is a good value for clear?

2) For any type of ignite proliferation (glove mod, support gem, cluster notable anything else?) does any source of increased AoE increase its proliferation radius (tree, support gem etc)?

-the best kind of Proliferation is global proliferation (gloves / cluster jewel...). If you can combine this kind of proliferation with corpse explosions then you have a chain reaction.

You could take Gentle touch gloves + prolif from a fire dot cluster jewel (i dont remember if you also need herald of ash for it)

-generic increased AOE should increase Aoe Radis

-It also depends on the skill i would guess - chaining Ethereal knives should clear pretty good by themself