I don't use biochar, although I
plan to make some because I like to play with fire.
As far as your experiences, did you pre- load the charcoal with compost tea
before using it? If you don't, it actually takes nutrients out of
circulation until it becomes "charged". But it sounds like great soil; I
don't know how biochar would improve it.
Here's a good FAQ on biochar in the garden
http://biochar.pbworks.com/FrontPage
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