I believe your carp(4) implementation might be getting in the way. As configured, carp is not being utilized for load balancing.. You might consider using real interfaces. See if it makes a difference.
If not, or for some real help instead of my fumblings, consider posting to misc@.
Next time, please enclose such pasted content in code tags. It makes things like routing tables much easier to read. As posted, I'm having trouble with it.
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