Bianchi Pista geometry

Sometimes the internet is no effing use at all. I think there was a significant geometry change to the Pista in 2012. Everyone talks about the frame (based, I reckon, on the 2007-2011 geo) having a steep 75 degree head angle, but the current charts show 73 degrees; similarly every post talks about a 28mm offset fork (which gives 62mm of trail with a 23mm tyre, as fitted back in the day). But 28mm on 73 degrees with a *25*mm tyre (as fitted now) would give 75mm of trail, which would be mad. So I think the new fork to go with the new geo must have 40mm of offset, but can't find anything to confirm this anywhere. I ask because I fancy changing the fork to something carboniferous (for no reason) but don't want to bugger the handling.

Anybody have any idea? Or do I have to get out bits of string and start measuring?

ETA: I was bored, so I got out the level and string and so on...and...yup. 28mm of rake, 75mm of trail. A Columbus Minimal with 45mm of rake will give me 57mm of trail, which is still 1mm more than my S3, so that should be fine, no?

WTF is the standard Pista geometry so odd? A Pre Cursa, with an Alpina track fork, has a trail of 55mm for instance, and normal trail is somewhere between 57 and 60mm on road bikes.