It's a good look at the Chloromancer, with one caveat: Stream of Reclamation does not trigger Radiant Spores and so won't do any healing on its own. What it does is increase the proc chance and healing effect from OTHER people triggering Radiant Spores, and as you said it deals a lot of damage.
Also I'm not sure what you really gain from 0-pt Warlock here. Life Leech is really sad healing, and you should already be healing yourself for quite a lot more just from the normal course of your rotation, and the death damage from Life Leech won't trigger Lifegiving Veil, so when you cast it you're in fact ONLY healing yourself and nobody else. Warlock DOES have some interesting branches if you sink some points into it. Opportunity is always a good choice for instance, and Magical Affinity would be beneficial as well.
I think at endgame you'd probably want to just ditch Warlock altogether though and replace it with Archon. I know you said you don't like Archon, but it really does have some good stuff and it further enhances your capabilities as a support class
EDIT: Minor factual correction
Edited, Mar 28th 2011 6:50pm by Callinon
If random outcomes aren't acceptable to you, then don't play with random people.