I've done the Orcutt - Lompoc route two ways - northbound on the 1 (IIRC, it was a long time ago), southbound on the back road, which is Harris Grade Rd. Harris Grade is very hilly, scenic and traffic free. I preferred this. But if you want to reduce (not avoid, though) the hills, you can on the Cabrillo Hwy (Hwy 1). Hwy 101 is a freeway, I would avoid that.

For Carpinteria to Ventura, both ways are good, it's just a choice of coast (flat) or mountain. Coast is flat and pretty dull around there, inland is a lovely climb & descent. Santa Barbara is ridiculously bike friendly, any bike shop in town should be able to get you a local bike route map (free probably) or I bet they have one on line. There's a ton of fun riding around there if you have time for detours.

This guy posted the Adventure Cycling maps on his site, click the gmap link after "Pacific Coast" and zoom in to the parts you are interested in.
http://tsteven4.qwestoffice.net/