The horizontal pitch of your tarp is fine provided the rain is straight down. But that is seldom the case. This vid is quite a good one for any hammock, not just the Hennessy that he is using.
http://www.youtube.com/watch?v=OwzZTeAE3yc
Hope you find it useful.
If you haven't already, look at the SHug videos. This is the first
http://www.youtube.com/watch?v=d7NZVqpBUV0
ANd for a primer on various suspension methods:
http://www.youtube.com/watch?v=1f2Xts3Spsc
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