While I can't help you with your shimano to campy question (all campy here), you can always look into a handle bar with a shorter reach and or a shorter stem. I use the new FSA shallow drops on my Lynskey L3 and on my 555. I can't remember what size your 555 is but it has been quite the challenge getting my 555's fit to match my Lynskey. B/c of the STA I ended up with a 20mm setback post and a 105 length stem vs. a 25mm post and a 110mm stem on my Lynskey. Had I gone with a small I'd have probably could have used a 25-30mm setback post with my normal 110 stem. I would have had more spacers than I prefer but than again I'd have more seatpost showing (have about 7" now). Just curious what size frame did you go with and what's your cycling inseem/height?