You don't say what your using, stock, TMO, RFB....w/without RSRDC?
Do you have mission orders, or do you want to just raid the harbor?
If your just raiding it I wouldn't even try it, wait until you get a better boat and if you have RSRDC raid Truk, easy to get in and out and always a good bag.
Last time I went into Rabaul on a raid, I was setting up for a shot when the U.S. Navy flyboys showed up and sank everything worth sinking !!!