It's weird...do an image search for CAAD10 and some of them with 17 deg stems look great...and some look like the front end is drooping (like the evo you posted).
My old colleague found that the -12 Bontrager stem is a perfect angle on the CAAD10, match the slop quite well (BTW the red is BRIGHT, Picture really doesn't do justice at how bright it is).
(The dale stems are 6 deg.)
It's weird...do an image search for CAAD10 and some of them with 17 deg stems look great...and some look like the front end is drooping (like the evo you posted).
I suspect the smaller sizes look better with 17.