Cervelo's don't come in my little size, so I can't help there - but I do have a tip about shoulder/neck issues. I was having trouble with my right shoulder. After about two hours on the bike I'd start to get a nasty burn in my shoulder neck area and after a while it was like someone was always sticking something sharp and pointy under my shoulder blade.
After a while with a PT I found two things that really helped (in addition to a smaller bike!). 1. no more computer mouse. I chucked the mouse in favor of a graphics tablet that I could keep on my lap so that I wasn't holding my arm up all day. 2. two tennis balls in a sock.... sounds silly, but it works so well. Put two tennis balls in a sock and tie it off. Sit on the floor legs straight on the ground (if it is too difficult at first you can keep your knees bent) put the tennis balls on the floor so that they will be under your lower back along your spine and lie down on top of them, start doing these stretches with your arms out to the side, but later you can try it with your arms over your head as your neck and shoulders start to loosen. Do this several times moving the tennis balls up your back until they are under your neck/shoulder area. I usually hear my back and neck make lovely cracks and I feel soooo much better.
This was the best thing the PT guys did for me - its cheap, really effective for me and I can do it anywhere.