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Don't use a tapered reamer and using a adjustable one will tale a long time to remove 1mm of radius.
There is no mechanical reason to need the bolt's head recessed (as Rolla's photo shows the lug has) so using s counter bore bit isn't needed (and they can be pricy). There's no mechanical reason to need a super smooth barrel ID and that ID really wants to be larger then the bolts by enough to allow the binder to close up around the post and not have the bolt binding up within the barrel.
Just had a thought from your first post. Is the barrel only 16mm long/deep? Have you placed a binder bolt of choice against the binder barrel to see if the two are in agreement lengthwise? How much binder barrel closing is needed to secure the post? What's the barrel's length then? 16mm is pretty short so do your homework. Andy
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AndrewRStewart