Going up to the San Juanís from Seattle is not really a Blue Water crossing (hell it's not really a crossing at all). Though the water is deep, it's hardly ocean sailing. The seas are generally under 3ft, with no swell and you are never out of sight of land. So I can't speak to the CAL 31ís Blue Water abilities.
I will say that in the snotty 20+knt winds and 4-5ft chop that I have encountered, she has taken it like a champ with no hint that she couldn't take more. I read a while back that somebody (I'm sure many) had circumnavigated in a 31. I'm sure she is up to it.
I would of course advise that you thoroughly check-out/inspect/refit any vessel that you want to take out on a true Blue Water crossing!
USCG Master 100T
S/V Priorities (79' CAL 31)