Don't smoke, Mike.
Join Date: Oct 2006
Bikes: Devinci Tosca, IRO Rob Roy
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Ya, I'd say so.
Do a few Google searches on bike fitting, that should turn up some helpful articles. Really though, I'd try to develop a relationship w/ a local bike shop and try out a few stem lengths is you're unsure of your setup. I know we have dozens and dozens of pull-off stems from new bikes. If you were to talk into my shop I'd let you "pay" for one of them and then experiement w/ length until you figure out what works best.
Cross is funny for bike fitting because of the extra abuse your body is soaking up vs. road riding. A lot of people go slightly shorter (1cm) vs their road bike and make a really good effort to be sure your position on the hoods is as comfortable as possible. Depending on what category you race in/your style of riding, you may spend the whole race on the hoods so try to avoid them being tilted forward too much or nasty "up and down" shapes. A lot of the time you need to rotate the bars up and the levers down to create a nice flat platform for your hands. In my experience, it's easier to do this with Campy/SRAM than Shimano, and some of the more compact drop bar designs might be too short in the top of the curves if you've got big hands.
Any "just do this one measurement/test and you're set" system is doomed to fail. There are too many factors: past injuries, specifics of your bike setup, personal preferences, etc. Try a few things out during training rides and see what works best.