There seem to be a number of war patrol logs available on line. I stumbled on the Batfish logs the other night, but unfortunately I didn't bookmark it and am having a lttle trouble finding it again. While looking for it, I have found the logs of the Sunfish (SS281) - see here:
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http://www.geocities.com/Heartland/Hills/2364/LOGS.html)
The Batfish logs were very interesting, as (IIRC) they dealt with the boat's patrols in the Bungo Straits (no mention of Bungo Pete though, that I remember).
In the Batfish logs, it was interesting to note the time spent doing research and logging data about weather, currents, thermal layers, etc. Also intriguing to note their comments about the ships they thought they sank versus what they were later credited with, and their experience with radar-equipped aircraft and escorts and the way they used their own radar sets as radar detectors to pick up both enemy and friendly sub activity. Perhaps the most interesting were the number of equipment/maintenance problems they experienced, especially with the radar equipment, and the discussions about the air conditioning and ventilation issues - I'm sure the U-boat crews would have gotten a big kick out of some of the things that the US crews complained about in that regard. Fascinating stuff out there.