I found a link to the Fine Art Model company's site that offers a model of the Gato/Baleo sub and the description had an interesting comment about the average dive times for the US Gato and Baleo class.
"The increased volume of the conning tower appurtenances led to a notable increase in crash-dive time. The U.S. Navy attached little importance to this. Minimum dive times of 50–60 seconds, which would have been unacceptable in Atlantic operations, were adequate for the kind of warfare being carried out in the Pacific. The excellent radar outfit gave adequate warning of an approaching enemy. "
The link is:
http://www.fineartmodels.com/pages/p...roduct_area=68
The earlier post by Finback about radar being very important for these subs, due to the slow dive times, is echoed in this comment. Just another knowledge nugget that the Pacific and the Atlantic were very different combat theatres.