I posted some
Bianchi steerer photos in an older thread. It indicates the difference between normal stem clamp marks and a crushed carbon stem.
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OP, you could lower the stem by 5mm with a half-height spacer (instead of the usual 10mm spacers.) And add another 5mm spacer above it so that the top cap still works. Maybe a different stem angle would be helpful.
This stem calculator will help pick from the available stem choices. (This calculator has been on the internet for years! very useful.)
http://yojimg.net/bike/web_tools/stem.php (note the http:// If I leave it off, defaulting to https:// it complains about a certificate.)
For example if you have 100mm at 5 degrees, and 30 mm of spacers:
(I used the example 73 degree head tube angle -- that's not critical with calculating a stem replacement like this.)
A 7 degree stem with 5 mm less spacers below is "close enough", making the bars just 1 mm lower than the original stem.
