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The problem is not with you. The problem is that he responded to you leaving him positive trust by adding you to his trust list. This made it so his trust rating was increased.
Can you honestly say that he would have added you to his trust list if you expressed reservations about him, havelock or ASICminer?
It is only a +1 point , come on guys. I've left him a positive feedback only because I trust him. I've left the feedback after not before

.
*and I also want to add :
I've never participate to a groupBuy managed by CanaryInTheMine , so the problem doesn't exist.
Your right it is only one additional point. But this is also probably not the first time something like this has happened.
The group buy issue is probably having to do with the fact that people who participated in his group buys have generally left him positive feedback (because they had a positive trading experience).