Hold on a second .. I have an email somewhere from that user and Frank. 
Apparently the problem ended up being on the proj side.

Hi FrankW we are trying to sort out that "off by a bit" reprojection 
between GeoTools and Proj that was reported a couple of months ago.

Cheers,
Jody
> Actually if the user's bug report is based on visual mismatch between two
> layers, and if a layer was projected with Proj4 (for example through a PostGIS
> database), it would be worth to ask which Proj version was used. According the
> test you did and mine, it sound like that Proj 4.4.6 and Proj 4.4.9 give
> different results, with Geotools matching Proj 4.4.9.
>
>       Martin
>
>
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