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both bikes have the same seat tube angle which makes it easier to compare. The ETT length of your Fuji (570) is right in between the two Felt sizes (560 and 580). So, that leads to the question: What size stem are using on your Fuji and many spacers? If you're running a short-ish stem, you might want to go w/ the smaller 56cm Felt. Vice-versa if you currently have a long stem.

Your current HT length is 170mm and the Felts are 140 and 160mm. So, that suggests that you should go w/ the bigger Felt, if you're already running a bunch of spacers on your Fuji.

Check out this link about frame sizing....it's pretty interesting and explains a lot.
Click on the Geometry and Fit tech presentation:

http://www.cervelo.com/en_us/engineering/tech-presentations/

The Fuji specifies Reach while the Felt specifies Front Center...I wonder if there's a way of converting one to the other (factoring in HTA, fork, etc). Too bad the Felt didn't spec Reach. Maybe you could contact them as ask if it's available.

Good luck.
 
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